Allowing _ as first character of identifiers in .fbs/.json.
Allowing _ as first character of identifiers in .fbs/.json.

Change-Id: Ie2cb42632f6a907a38e10b2c9be1536cf330b2fa
Tested: on Linux.

tieusangaka/flatbuffers,tieusangaka/flatbuffers,chobie/flatbuffers,dwillmer/flatbuffers,MiCHiLU/flatbuffers,ajrulez/flatbuffers,pjulien/flatbuffers,eburkitt/flatbuffers,pakoito/flatbuffers,jasonstubbs/flatbuffers,yiliaofan/flatbuffers,jasonstubbs/flatbuffers,KeronTeam/flatbuffers,DreamHill/flatbuffers,alarouche/flatbuffers,1yvT0s/flatbuffers,google/flatbuffers,wingahi/flatbuffers,aeneid/flatbuffers,aeneid/flatbuffers,google/flatbuffers,evolutional/flatbuffers,fengshao0907/flatbuffers,rw/flatbuffers,jekinchen/flatjni,ajrulez/flatbuffers,dwillmer/flatbuffers,i17c/flatbuffers,stewartmiles/flatbuffers,EricLagergren/flatbuffers,google/flatbuffers,endorph-soft/flatbuffers,i17c/flatbuffers,vanloswang/flatbuffers,xiaPier/flatbuffers,royalharsh/flatbuffers,ajrulez/flatbuffers,layzerar/flatbuffers,RyanTech/flatbuffers,guker/flatbuffers,stewartmiles/flatbuffers,FrankStain/flatbuffers,wheelcomplex/flatbuffers,KeronTeam/flatbuffers,dwillmer/flatbuffers,zarianw/flatbuffers,kadirahq/flatbuffers,mormegil-cz/flatbuffers,kiyoto-suzuki/flatbuffers,vanloswang/flatbuffers,RAldrich/flatbuffers,stewartmiles/flatbuffers,xudeheng/flatbuffers,ajrulez/flatbuffers,alarouche/flatbuffers,ajrulez/flatbuffers,davidnasar/flatbuffers,alexames/flatbuffers,google/flatbuffers,hryang/flatbuffers,pjulien/flatbuffers,MiCHiLU/flatbuffers,jackyglony/flatbuffers,DavadDi/flatbuffers,hanhailong/flatbuffers,vitalyisaev2/flatbuffers,endorph-soft/flatbuffers,uus169/flatbuffers,guker/flatbuffers,pjulien/flatbuffers,endorph-soft/flatbuffers,kiyoto-suzuki/flatbuffers,hanhailong/flatbuffers,vitalyisaev2/flatbuffers,robertfsegal/flatbuffers,FrankStain/flatbuffers,FrankStain/flatbuffers,MiCHiLU/flatbuffers,layzerar/flatbuffers,aeneid/flatbuffers,layzerar/flatbuffers,evolutional/flatbuffers,zarianw/flatbuffers,google/flatbuffers,iperry/flatbuffers,i17c/flatbuffers,dwillmer/flatbuffers,eproxus/flatbuffers,fengshao0907/flatbuffers,fuchsia-mirror/third_party-flatbuffers,lulufei/flatbuffers,splhack/flatbuffers,mormegil-cz/flatbuffers,eburkitt/flatbuffers,yiliaofan/flatbuffers,alexames/flatbuffers,wheelcomplex/flatbuffers,felixguendling/flatbuffers,benssson/flatbuffers,vitalyisaev2/flatbuffers,hgl888/flatbuffers,pakoito/flatbuffers,eburkitt/flatbuffers,jackyglony/flatbuffers,i17c/flatbuffers,alexames/flatbuffers,bog-dan-ro/flatbuffers,fuchsia-mirror/third_party-flatbuffers,evolutional/flatbuffers,chobie/flatbuffers,vitalyisaev2/flatbuffers,FrankStain/flatbuffers,wuyan6293/flatbuffers,benssson/flatbuffers,tieusangaka/flatbuffers,brunoqc/flatbuffers,chenkai036/flatbuffers,felixguendling/flatbuffers,pjulien/flatbuffers,KeronTeam/flatbuffers,google/flatbuffers,zarianw/flatbuffers,jasonstubbs/flatbuffers,stewartmiles/flatbuffers,alarouche/flatbuffers,MiCHiLU/flatbuffers,stewartmiles/flatbuffers,kiyoto-suzuki/flatbuffers,hanhailong/flatbuffers,hanhailong/flatbuffers,aeneid/flatbuffers,splhack/flatbuffers,Belxjander/flatbuffers,wuyan6293/flatbuffers,jekinchen/flatjni,jackyglony/flatbuffers,splhack/flatbuffers,alarouche/flatbuffers,wingahi/flatbuffers,vitalyisaev2/flatbuffers,yaolinz/flatbuffers,chenkai036/flatbuffers,kadirahq/flatbuffers,royalharsh/flatbuffers,RyanTech/flatbuffers,guker/flatbuffers,rw/flatbuffers,rw/flatbuffers,marschall/flatbuffers,eproxus/flatbuffers,KeronTeam/flatbuffers,tieusangaka/flatbuffers,chenkai036/flatbuffers,alexames/flatbuffers,uus169/flatbuffers,hanhailong/flatbuffers,royalharsh/flatbuffers,felixguendling/flatbuffers,mormegil-cz/flatbuffers,yaolinz/flatbuffers,chenkai036/flatbuffers,jbrads/flatbuffers,google/flatbuffers,xudeheng/flatbuffers,eburkitt/flatbuffers,DavadDi/flatbuffers,robertfsegal/flatbuffers,iperry/flatbuffers,evanw/flatbuffers,kadirahq/flatbuffers,SinbadFreedom/FlatBuffer,pjulien/flatbuffers,eproxus/flatbuffers,fuchsia-mirror/third_party-flatbuffers,chobie/flatbuffers,hryang/flatbuffers,iperry/flatbuffers,jasonstubbs/flatbuffers,layzerar/flatbuffers,jasonstubbs/flatbuffers,evolutional/flatbuffers,endorph-soft/flatbuffers,xiaPier/flatbuffers,Reimerei/flatbuffers,kiyoto-suzuki/flatbuffers,pakoito/flatbuffers,wheelcomplex/flatbuffers,wingahi/flatbuffers,dwillmer/flatbuffers,chenkai036/flatbuffers,chobie/flatbuffers,1yvT0s/flatbuffers,fuchsia-mirror/third_party-flatbuffers,Reimerei/flatbuffers,stewartmiles/flatbuffers,rw/flatbuffers,rw/flatbuffers,iperry/flatbuffers,SinbadFreedom/FlatBuffer,royalharsh/flatbuffers,wingahi/flatbuffers,tieusangaka/flatbuffers,MiCHiLU/flatbuffers,bog-dan-ro/flatbuffers,lulufei/flatbuffers,wheelcomplex/flatbuffers,rw/flatbuffers,xudeheng/flatbuffers,stewartmiles/flatbuffers,davidnasar/flatbuffers,SinbadFreedom/FlatBuffer,RAldrich/flatbuffers,eburkitt/flatbuffers,vanloswang/flatbuffers,yaolinz/flatbuffers,eproxus/flatbuffers,brunoqc/flatbuffers,vanloswang/flatbuffers,fuchsia-mirror/third_party-flatbuffers,evanw/flatbuffers,Volcanoscar/flatbuffers,bog-dan-ro/flatbuffers,pjulien/flatbuffers,pjulien/flatbuffers,xudeheng/flatbuffers,Belxjander/flatbuffers,hgl888/flatbuffers,chobie/flatbuffers,zhuxiaohao/flatbuffers,davidnasar/flatbuffers,jbrads/flatbuffers,wuyan6293/flatbuffers,jbrads/flatbuffers,hanhailong/flatbuffers,kadirahq/flatbuffers,fengshao0907/flatbuffers,DreamHill/flatbuffers,vitalyisaev2/flatbuffers,chenkai036/flatbuffers,SinbadFreedom/FlatBuffer,pakoito/flatbuffers,chenkai036/flatbuffers,jekinchen/flatjni,royalharsh/flatbuffers,endorph-soft/flatbuffers,google/flatbuffers,FrankStain/flatbuffers,RAldrich/flatbuffers,eburkitt/flatbuffers,jbrads/flatbuffers,davidnasar/flatbuffers,zarianw/flatbuffers,alexames/flatbuffers,evolutional/flatbuffers,DavadDi/flatbuffers,robertfsegal/flatbuffers,fengshao0907/flatbuffers,EricLagergren/flatbuffers,chenkai036/flatbuffers,fuchsia-mirror/third_party-flatbuffers,endorph-soft/flatbuffers,kiyoto-suzuki/flatbuffers,jackyglony/flatbuffers,evolutional/flatbuffers,endorph-soft/flatbuffers,cogumbreiro/flatbuffers,evolutional/flatbuffers,jasonstubbs/flatbuffers,pjulien/flatbuffers,vanloswang/flatbuffers,marschall/flatbuffers,kiyoto-suzuki/flatbuffers,jekinchen/flatjni,xiaPier/flatbuffers,pjulien/flatbuffers,vitalyisaev2/flatbuffers,davidnasar/flatbuffers,wheelcomplex/flatbuffers,splhack/flatbuffers,uus169/flatbuffers,evanw/flatbuffers,xudeheng/flatbuffers,mormegil-cz/flatbuffers,DreamHill/flatbuffers,hryang/flatbuffers,evolutional/flatbuffers,splhack/flatbuffers,rw/flatbuffers,RyanTech/flatbuffers,i17c/flatbuffers,royalharsh/flatbuffers,layzerar/flatbuffers,stewartmiles/flatbuffers,Reimerei/flatbuffers,cogumbreiro/flatbuffers,guker/flatbuffers,SinbadFreedom/FlatBuffer,hgl888/flatbuffers,JackLian/flatbuffers,alexames/flatbuffers,1yvT0s/flatbuffers,yaolinz/flatbuffers,hryang/flatbuffers,xiaPier/flatbuffers,eburkitt/flatbuffers,eburkitt/flatbuffers,benssson/flatbuffers,KeronTeam/flatbuffers,lulufei/flatbuffers,fuchsia-mirror/third_party-flatbuffers,benssson/flatbuffers,SinbadFreedom/FlatBuffer,1yvT0s/flatbuffers,kiyoto-suzuki/flatbuffers,xiaPier/flatbuffers,JackLian/flatbuffers,jbrads/flatbuffers,felixguendling/flatbuffers,jekinchen/flatjni,uus169/flatbuffers,EricLagergren/flatbuffers,stewartmiles/flatbuffers,evanw/flatbuffers,Reimerei/flatbuffers,FrankStain/flatbuffers,MiCHiLU/flatbuffers,Volcanoscar/flatbuffers,Belxjander/flatbuffers,KeronTeam/flatbuffers,jekinchen/flatjni,Volcanoscar/flatbuffers,zhuxiaohao/flatbuffers,ajrulez/flatbuffers,evanw/flatbuffers,Volcanoscar/flatbuffers,google/flatbuffers,jekinchen/flatjni,RyanTech/flatbuffers,rw/flatbuffers,evolutional/flatbuffers,davidnasar/flatbuffers,iperry/flatbuffers,benssson/flatbuffers,yiliaofan/flatbuffers,fengshao0907/flatbuffers,kadirahq/flatbuffers,pjulien/flatbuffers,alexames/flatbuffers,splhack/flatbuffers,Belxjander/flatbuffers,hgl888/flatbuffers,wheelcomplex/flatbuffers,pakoito/flatbuffers,RAldrich/flatbuffers,wingahi/flatbuffers,JackLian/flatbuffers,google/flatbuffers,lulufei/flatbuffers,google/flatbuffers,EricLagergren/flatbuffers,alexames/flatbuffers,vitalyisaev2/flatbuffers,bog-dan-ro/flatbuffers,guker/flatbuffers,EricLagergren/flatbuffers,royalharsh/flatbuffers,RAldrich/flatbuffers,jackyglony/flatbuffers,layzerar/flatbuffers,kiyoto-suzuki/flatbuffers,jackyglony/flatbuffers,pakoito/flatbuffers,Belxjander/flatbuffers,alexames/flatbuffers,zhuxiaohao/flatbuffers,felixguendling/flatbuffers,royalharsh/flatbuffers,iperry/flatbuffers,jasonstubbs/flatbuffers,brunoqc/flatbuffers,DavadDi/flatbuffers,hgl888/flatbuffers,cogumbreiro/flatbuffers,alexames/flatbuffers,robertfsegal/flatbuffers,layzerar/flatbuffers,rw/flatbuffers,rw/flatbuffers,zarianw/flatbuffers,hryang/flatbuffers,zhuxiaohao/flatbuffers,aeneid/flatbuffers,brunoqc/flatbuffers,aeneid/flatbuffers,kiyoto-suzuki/flatbuffers,DavadDi/flatbuffers,google/flatbuffers,marschall/flatbuffers,uus169/flatbuffers,jasonstubbs/flatbuffers,benssson/flatbuffers,evanw/flatbuffers,lulufei/flatbuffers,MiCHiLU/flatbuffers,chobie/flatbuffers,DreamHill/flatbuffers,royalharsh/flatbuffers,lulufei/flatbuffers,evanw/flatbuffers,yiliaofan/flatbuffers,benssson/flatbuffers,zarianw/flatbuffers,chobie/flatbuffers,yaolinz/flatbuffers,wheelcomplex/flatbuffers,benssson/flatbuffers,marschall/flatbuffers,SinbadFreedom/FlatBuffer,alexames/flatbuffers,jbrads/flatbuffers,jekinchen/flatjni,tieusangaka/flatbuffers,eproxus/flatbuffers,alexames/flatbuffers,cogumbreiro/flatbuffers,jbrads/flatbuffers,felixguendling/flatbuffers,uus169/flatbuffers,kadirahq/flatbuffers,bog-dan-ro/flatbuffers,yaolinz/flatbuffers,alexames/flatbuffers,bog-dan-ro/flatbuffers,splhack/flatbuffers,DreamHill/flatbuffers,xudeheng/flatbuffers,wuyan6293/flatbuffers,rw/flatbuffers,kadirahq/flatbuffers,bog-dan-ro/flatbuffers,EricLagergren/flatbuffers,DavadDi/flatbuffers,royalharsh/flatbuffers,google/flatbuffers,alarouche/flatbuffers,stewartmiles/flatbuffers,MiCHiLU/flatbuffers,JackLian/flatbuffers,i17c/flatbuffers,chenkai036/flatbuffers,zhuxiaohao/flatbuffers,yiliaofan/flatbuffers,FrankStain/flatbuffers,google/flatbuffers,evolutional/flatbuffers,chobie/flatbuffers,wuyan6293/flatbuffers,jbrads/flatbuffers,cogumbreiro/flatbuffers,endorph-soft/flatbuffers,marschall/flatbuffers,alexames/flatbuffers,guker/flatbuffers,Volcanoscar/flatbuffers,RyanTech/flatbuffers,zarianw/flatbuffers,Belxjander/flatbuffers,xiaPier/flatbuffers,jekinchen/flatjni,stewartmiles/flatbuffers,Reimerei/flatbuffers,pjulien/flatbuffers,robertfsegal/flatbuffers,pjulien/flatbuffers,iperry/flatbuffers,bog-dan-ro/flatbuffers,RyanTech/flatbuffers,SinbadFreedom/FlatBuffer,eproxus/flatbuffers,Reimerei/flatbuffers,fuchsia-mirror/third_party-flatbuffers,kadirahq/flatbuffers,hryang/flatbuffers,brunoqc/flatbuffers,JackLian/flatbuffers,brunoqc/flatbuffers,1yvT0s/flatbuffers,yiliaofan/flatbuffers,evolutional/flatbuffers,chenkai036/flatbuffers,google/flatbuffers,JackLian/flatbuffers,rw/flatbuffers,jekinchen/flatjni,iperry/flatbuffers,Reimerei/flatbuffers,endorph-soft/flatbuffers,zarianw/flatbuffers,mormegil-cz/flatbuffers,FrankStain/flatbuffers,EricLagergren/flatbuffers,splhack/flatbuffers,dwillmer/flatbuffers,vanloswang/flatbuffers,wingahi/flatbuffers,1yvT0s/flatbuffers,stewartmiles/flatbuffers,robertfsegal/flatbuffers,RAldrich/flatbuffers,endorph-soft/flatbuffers,EricLagergren/flatbuffers,Volcanoscar/flatbuffers,evanw/flatbuffers,marschall/flatbuffers,wuyan6293/flatbuffers,zhuxiaohao/flatbuffers,cogumbreiro/flatbuffers,evolutional/flatbuffers,alarouche/flatbuffers,wheelcomplex/flatbuffers,DreamHill/flatbuffers,fengshao0907/flatbuffers,alexames/flatbuffers,evolutional/flatbuffers,mormegil-cz/flatbuffers,stewartmiles/flatbuffers,hgl888/flatbuffers