Added --multibyte_chars option
Added --multibyte_chars option

Added --multibyte_chars option for ARM and uARM build.

This enables to use multi-byte character such as Japanese or Chinese
especially for string literal.
It should not be affected single-byte character set.  Tested with
Japanese Windows environment.

maximmbed/mbed,devanlai/mbed,radhika-raghavendran/mbed-os5.1-onsemi,Willem23/mbed,kpurusho/mbed,screamerbg/mbed,jpbrucker/mbed,al177/mbed,Marcomissyou/mbed,alertby/mbed,RonEld/mbed,jferreir/mbed,DanKupiniak/mbed,rgrover/mbed,jpbrucker/mbed,RonEld/mbed,bcostm/mbed-os,pradeep-gr/mbed-os5-onsemi,geky/mbed,monkiineko/mbed-os,RonEld/mbed,fvincenzo/mbed-os,monkiineko/mbed-os,K4zuki/mbed,cvtsi2sd/mbed-os,nabilbendafi/mbed,theotherjimmy/mbed,sg-/mbed-drivers,kpurusho/mbed,netzimme/mbed-os,pedromes/mbed,DanKupiniak/mbed,HeadsUpDisplayInc/mbed,JasonHow44/mbed,j-greffe/mbed-os,fvincenzo/mbed-os,dbestm/mbed,jamesadevine/mbed,alertby/mbed,theotherjimmy/mbed,tung7970/mbed-os-1,Timmmm/mbed,larks/mbed,logost/mbed,karsev/mbed-os,adustm/mbed,mikaleppanen/mbed-os,bentwire/mbed,brstew/MBED-BUILD,DanKupiniak/mbed,nvlsianpu/mbed,infinnovation/mbed-os,bcostm/mbed-os,FranklyDev/mbed,Marcomissyou/mbed,jrjang/mbed,0xc0170/mbed-drivers,pedromes/mbed,kpurusho/mbed,wodji/mbed,ryankurte/mbed-os,mmorenobarm/mbed-os,pradeep-gr/mbed-os5-onsemi,bulislaw/mbed-os,betzw/mbed-os,andcor02/mbed-os,GustavWi/mbed,maximmbed/mbed,fanghuaqi/mbed,tung7970/mbed-os,JasonHow44/mbed,Marcomissyou/mbed,jamesadevine/mbed,maximmbed/mbed,screamerbg/mbed,GustavWi/mbed,nRFMesh/mbed-os,CalSol/mbed,jpbrucker/mbed,HeadsUpDisplayInc/mbed,kjbracey-arm/mbed,Marcomissyou/mbed,rosterloh/mbed,netzimme/mbed-os,xcrespo/mbed,nRFMesh/mbed-os,autopulated/mbed,getopenmono/mbed,bulislaw/mbed-os,EmuxEvans/mbed,bulislaw/mbed-os,devanlai/mbed,j-greffe/mbed-os,bcostm/mbed-os,ryankurte/mbed-os,adamgreen/mbed,theotherjimmy/mbed,adamgreen/mbed,bcostm/mbed-os,svastm/mbed,fvincenzo/mbed-os,fpiot/mbed-ats,naves-thiago/mbed-midi,FranklyDev/mbed,fahhem/mbed-os,ban4jp/mbed,JasonHow44/mbed,getopenmono/mbed,nvlsianpu/mbed,andcor02/mbed-os,HeadsUpDisplayInc/mbed,Marcomissyou/mbed,mmorenobarm/mbed-os,mikaleppanen/mbed-os,nabilbendafi/mbed,masaohamanaka/mbed,logost/mbed,mnlipp/mbed,fvincenzo/mbed-os,ban4jp/mbed,tung7970/mbed-os-1,K4zuki/mbed,Willem23/mbed,nvlsianpu/mbed,brstew/MBED-BUILD,NXPmicro/mbed,EmuxEvans/mbed,screamerbg/mbed,EmuxEvans/mbed,karsev/mbed-os,tung7970/mbed-os,RonEld/mbed,NXPmicro/mbed,xcrespo/mbed,mbedmicro/mbed,0xc0170/mbed-drivers,sam-geek/mbed,svogl/mbed-os,devanlai/mbed,bremoran/mbed-drivers,arostm/mbed-os,Marcomissyou/mbed,andcor02/mbed-os,Archcady/mbed-os,Willem23/mbed,struempelix/mbed,adamgreen/mbed,kpurusho/mbed,larks/mbed,pbrook/mbed,nRFMesh/mbed-os,hwfwgrp/mbed,rgrover/mbed,c1728p9/mbed-os,ARM-software/mbed-beetle,nabilbendafi/mbed,Shengliang/mbed,kl-cruz/mbed-os,fahhem/mbed-os,karsev/mbed-os,rosterloh/mbed,struempelix/mbed,sam-geek/mbed,jrjang/mbed,xcrespo/mbed,DanKupiniak/mbed,mbedmicro/mbed,Timmmm/mbed,pbrook/mbed,jeremybrodt/mbed,svogl/mbed-os,catiedev/mbed-os,getopenmono/mbed,naves-thiago/mbed-midi,ryankurte/mbed-os,EmuxEvans/mbed,NXPmicro/mbed,maximmbed/mbed,masaohamanaka/mbed,svogl/mbed-os,andreaslarssonublox/mbed,HeadsUpDisplayInc/mbed,infinnovation/mbed-os,bulislaw/mbed-os,radhika-raghavendran/mbed-os5.1-onsemi,kpurusho/mbed,catiedev/mbed-os,jferreir/mbed,karsev/mbed-os,JasonHow44/mbed,pbrook/mbed,sam-geek/mbed,catiedev/mbed-os,bentwire/mbed,geky/mbed,theotherjimmy/mbed,ban4jp/mbed,larks/mbed,fahhem/mbed-os,K4zuki/mbed,catiedev/mbed-os,c1728p9/mbed-os,fpiot/mbed-ats,geky/mbed,adustm/mbed,mnlipp/mbed,YarivCol/mbed-os,catiedev/mbed-os,cvtsi2sd/mbed-os,monkiineko/mbed-os,naves-thiago/mbed-midi,Sweet-Peas/mbed,radhika-raghavendran/mbed-os5.1-onsemi,CalSol/mbed,bcostm/mbed-os,Timmmm/mbed,al177/mbed,andreaslarssonublox/mbed,bcostm/mbed-os,FranklyDev/mbed,netzimme/mbed-os,dbestm/mbed,hwfwgrp/mbed,K4zuki/mbed,bentwire/mbed,nRFMesh/mbed-os,YarivCol/mbed-os,bentwire/mbed,al177/mbed,struempelix/mbed,andcor02/mbed-os,pradeep-gr/mbed-os5-onsemi,cvtsi2sd/mbed-os,j-greffe/mbed-os,betzw/mbed-os,Tiryoh/mbed,jamesadevine/mbed,tung7970/mbed-os-1,geky/mbed,masaohamanaka/mbed,dbestm/mbed,dbestm/mbed,rosterloh/mbed,nvlsianpu/mbed,c1728p9/mbed-os,CalSol/mbed,JasonHow44/mbed,CalSol/mbed,fpiot/mbed-ats,theotherjimmy/mbed,fahhem/mbed-os,mmorenobarm/mbed-os,mazimkhan/mbed-os,mbedmicro/mbed,pbrook/mbed,autopulated/mbed,naves-thiago/mbed-midi,wodji/mbed,geky/mbed,sg-/mbed-drivers,struempelix/mbed,EmuxEvans/mbed,svastm/mbed,maximmbed/mbed,brstew/MBED-BUILD,svastm/mbed,mikaleppanen/mbed-os,autopulated/mbed,c1728p9/mbed-os,cvtsi2sd/mbed-os,HeadsUpDisplayInc/mbed,c1728p9/mbed-os,infinnovation/mbed-os,devanlai/mbed,sam-geek/mbed,Timmmm/mbed,GustavWi/mbed,svogl/mbed-os,logost/mbed,adustm/mbed,hwfwgrp/mbed,andreaslarssonublox/mbed,Tiryoh/mbed,getopenmono/mbed,j-greffe/mbed-os,svogl/mbed-os,larks/mbed,rgrover/mbed,RonEld/mbed,al177/mbed,dbestm/mbed,mnlipp/mbed,Shengliang/mbed,mnlipp/mbed,adustm/mbed,pedromes/mbed,jpbrucker/mbed,xcrespo/mbed,NitinBhaskar/mbed,fvincenzo/mbed-os,jferreir/mbed,ARM-software/mbed-beetle,mazimkhan/mbed-os,jamesadevine/mbed,jrjang/mbed,Tiryoh/mbed,mikaleppanen/mbed-os,ryankurte/mbed-os,arostm/mbed-os,radhika-raghavendran/mbed-os5.1-onsemi,jferreir/mbed,theotherjimmy/mbed,fanghuaqi/mbed,rgrover/mbed,adamgreen/mbed,wodji/mbed,alertby/mbed,mbedmicro/mbed,devanlai/mbed,wodji/mbed,andreaslarssonublox/mbed,Willem23/mbed,jeremybrodt/mbed,al177/mbed,betzw/mbed-os,FranklyDev/mbed,Sweet-Peas/mbed,pi19404/mbed,adustm/mbed,jeremybrodt/mbed,hwfwgrp/mbed,radhika-raghavendran/mbed-os5.1-onsemi,ryankurte/mbed-os,pedromes/mbed,fahhem/mbed-os,netzimme/mbed-os,NXPmicro/mbed,catiedev/mbed-os,mmorenobarm/mbed-os,pi19404/mbed,jferreir/mbed,tung7970/mbed-os-1,adamgreen/mbed,Archcady/mbed-os,svogl/mbed-os,c1728p9/mbed-os,bikeNomad/mbed,RonEld/mbed,larks/mbed,NitinBhaskar/mbed,jeremybrodt/mbed,YarivCol/mbed-os,nRFMesh/mbed-os,mazimkhan/mbed-os,rosterloh/mbed,infinnovation/mbed-os,kjbracey-arm/mbed,pedromes/mbed,ban4jp/mbed,nabilbendafi/mbed,GustavWi/mbed,al177/mbed,masaohamanaka/mbed,pi19404/mbed,kjbracey-arm/mbed,mikaleppanen/mbed-os,nRFMesh/mbed-os,dbestm/mbed,nvlsianpu/mbed,jrjang/mbed,YarivCol/mbed-os,brstew/MBED-BUILD,netzimme/mbed-os,xcrespo/mbed,pi19404/mbed,nvlsianpu/mbed,infinnovation/mbed-os,ban4jp/mbed,kl-cruz/mbed-os,j-greffe/mbed-os,pedromes/mbed,monkiineko/mbed-os,Archcady/mbed-os,YarivCol/mbed-os,arostm/mbed-os,Shengliang/mbed,ARM-software/mbed-beetle,karsev/mbed-os,alertby/mbed,kl-cruz/mbed-os,fpiot/mbed-ats,mazimkhan/mbed-os,wodji/mbed,jamesadevine/mbed,logost/mbed,karsev/mbed-os,hwfwgrp/mbed,bikeNomad/mbed,andreaslarssonublox/mbed,alertby/mbed,naves-thiago/mbed-midi,Shengliang/mbed,mnlipp/mbed,kl-cruz/mbed-os,mmorenobarm/mbed-os,cvtsi2sd/mbed-os,devanlai/mbed,bremoran/mbed-drivers,Sweet-Peas/mbed,pbrook/mbed,pbrook/mbed,brstew/MBED-BUILD,jrjang/mbed,pradeep-gr/mbed-os5-onsemi,nabilbendafi/mbed,ryankurte/mbed-os,bulislaw/mbed-os,autopulated/mbed,cvtsi2sd/mbed-os,pi19404/mbed,getopenmono/mbed,Tiryoh/mbed,logost/mbed,fanghuaqi/mbed,mnlipp/mbed,logost/mbed,wodji/mbed,screamerbg/mbed,kl-cruz/mbed-os,tung7970/mbed-os,kpurusho/mbed,iriark01/mbed-drivers,j-greffe/mbed-os,GustavWi/mbed,adamgreen/mbed,pradeep-gr/mbed-os5-onsemi,fanghuaqi/mbed,larks/mbed,fahhem/mbed-os,tung7970/mbed-os,masaohamanaka/mbed,infinnovation/mbed-os,bikeNomad/mbed,arostm/mbed-os,svastm/mbed,NitinBhaskar/mbed,Shengliang/mbed,pradeep-gr/mbed-os5-onsemi,FranklyDev/mbed,jpbrucker/mbed,autopulated/mbed,andcor02/mbed-os,radhika-raghavendran/mbed-os5.1-onsemi,tung7970/mbed-os,jpbrucker/mbed,Tiryoh/mbed,K4zuki/mbed,fpiot/mbed-ats,pi19404/mbed,rosterloh/mbed,CalSol/mbed,bentwire/mbed,Sweet-Peas/mbed,jrjang/mbed,iriark01/mbed-drivers,rgrover/mbed,fanghuaqi/mbed,maximmbed/mbed,rosterloh/mbed,Timmmm/mbed,monkiineko/mbed-os,kjbracey-arm/mbed,tung7970/mbed-os-1,bikeNomad/mbed,mikaleppanen/mbed-os,getopenmono/mbed,ban4jp/mbed,K4zuki/mbed,jeremybrodt/mbed,naves-thiago/mbed-midi,YarivCol/mbed-os,betzw/mbed-os,Timmmm/mbed,JasonHow44/mbed,monkiineko/mbed-os,Shengliang/mbed,arostm/mbed-os,struempelix/mbed,masaohamanaka/mbed,svastm/mbed,arostm/mbed-os,jferreir/mbed,mazimkhan/mbed-os,NitinBhaskar/mbed,struempelix/mbed,screamerbg/mbed,Tiryoh/mbed,CalSol/mbed,Sweet-Peas/mbed,andcor02/mbed-os,Archcady/mbed-os,screamerbg/mbed,mbedmicro/mbed,NXPmicro/mbed,mazimkhan/mbed-os,Archcady/mbed-os,nabilbendafi/mbed,kl-cruz/mbed-os,xcrespo/mbed,mmorenobarm/mbed-os,Archcady/mbed-os,alertby/mbed,netzimme/mbed-os,HeadsUpDisplayInc/mbed,Sweet-Peas/mbed,NitinBhaskar/mbed,betzw/mbed-os,sam-geek/mbed,adustm/mbed,autopulated/mbed,brstew/MBED-BUILD,jamesadevine/mbed,hwfwgrp/mbed,NXPmicro/mbed,bulislaw/mbed-os,betzw/mbed-os,EmuxEvans/mbed,bentwire/mbed,bikeNomad/mbed,ARM-software/mbed-beetle,fpiot/mbed-ats,Willem23/mbed