zerver/lib/bugdown/fenced_code.py: Fix types.
zerver/lib/bugdown/fenced_code.py: Fix types.

Change some important string literals from str to unicode.
Annotate format_code and codehilite_conf in FencedBlockProcessor.

vikas-parashar/zulip,sup95/zulip,vabs22/zulip,reyha/zulip,souravbadami/zulip,Juanvulcano/zulip,Juanvulcano/zulip,JPJPJPOPOP/zulip,calvinleenyc/zulip,jackrzhang/zulip,timabbott/zulip,synicalsyntax/zulip,shubhamdhama/zulip,zulip/zulip,reyha/zulip,Jianchun1/zulip,andersk/zulip,rishig/zulip,samatdav/zulip,mahim97/zulip,susansls/zulip,sharmaeklavya2/zulip,jackrzhang/zulip,arpith/zulip,jrowan/zulip,KingxBanana/zulip,Jianchun1/zulip,brockwhittaker/zulip,zulip/zulip,shubhamdhama/zulip,brainwane/zulip,amanharitsh123/zulip,christi3k/zulip,rishig/zulip,synicalsyntax/zulip,shubhamdhama/zulip,Juanvulcano/zulip,jrowan/zulip,zulip/zulip,JPJPJPOPOP/zulip,AZtheAsian/zulip,punchagan/zulip,brockwhittaker/zulip,jphilipsen05/zulip,ryanbackman/zulip,grave-w-grave/zulip,sonali0901/zulip,brockwhittaker/zulip,punchagan/zulip,showell/zulip,TigorC/zulip,souravbadami/zulip,susansls/zulip,brainwane/zulip,paxapy/zulip,dhcrzf/zulip,kou/zulip,jphilipsen05/zulip,brockwhittaker/zulip,Jianchun1/zulip,JPJPJPOPOP/zulip,calvinleenyc/zulip,sharmaeklavya2/zulip,christi3k/zulip,ahmadassaf/zulip,Diptanshu8/zulip,aakash-cr7/zulip,ryanbackman/zulip,ryanbackman/zulip,reyha/zulip,paxapy/zulip,sharmaeklavya2/zulip,dattatreya303/zulip,amyliu345/zulip,PhilSk/zulip,rishig/zulip,paxapy/zulip,dawran6/zulip,joyhchen/zulip,grave-w-grave/zulip,andersk/zulip,showell/zulip,synicalsyntax/zulip,mahim97/zulip,jphilipsen05/zulip,sharmaeklavya2/zulip,KingxBanana/zulip,ahmadassaf/zulip,sonali0901/zulip,mohsenSy/zulip,niftynei/zulip,Diptanshu8/zulip,dawran6/zulip,joyhchen/zulip,vabs22/zulip,samatdav/zulip,kou/zulip,TigorC/zulip,tommyip/zulip,AZtheAsian/zulip,rht/zulip,vabs22/zulip,vikas-parashar/zulip,PhilSk/zulip,hackerkid/zulip,zacps/zulip,Juanvulcano/zulip,kou/zulip,niftynei/zulip,dattatreya303/zulip,jrowan/zulip,Diptanshu8/zulip,susansls/zulip,susansls/zulip,Diptanshu8/zulip,joyhchen/zulip,showell/zulip,ahmadassaf/zulip,andersk/zulip,timabbott/zulip,SmartPeople/zulip,timabbott/zulip,rishig/zulip,timabbott/zulip,blaze225/zulip,TigorC/zulip,Galexrt/zulip,isht3/zulip,umkay/zulip,cosmicAsymmetry/zulip,timabbott/zulip,samatdav/zulip,KingxBanana/zulip,rht/zulip,souravbadami/zulip,vaidap/zulip,verma-varsha/zulip,mohsenSy/zulip,cosmicAsymmetry/zulip,sup95/zulip,synicalsyntax/zulip,isht3/zulip,kou/zulip,eeshangarg/zulip,sonali0901/zulip,showell/zulip,samatdav/zulip,brockwhittaker/zulip,arpith/zulip,rht/zulip,showell/zulip,ahmadassaf/zulip,tommyip/zulip,krtkmj/zulip,dattatreya303/zulip,rht/zulip,amyliu345/zulip,vikas-parashar/zulip,dhcrzf/zulip,jainayush975/zulip,kou/zulip,SmartPeople/zulip,samatdav/zulip,hackerkid/zulip,tommyip/zulip,krtkmj/zulip,amyliu345/zulip,sharmaeklavya2/zulip,aakash-cr7/zulip,timabbott/zulip,sharmaeklavya2/zulip,mahim97/zulip,rishig/zulip,mahim97/zulip,synicalsyntax/zulip,dhcrzf/zulip,eeshangarg/zulip,cosmicAsymmetry/zulip,amanharitsh123/zulip,Juanvulcano/zulip,brainwane/zulip,zacps/zulip,Jianchun1/zulip,zacps/zulip,synicalsyntax/zulip,eeshangarg/zulip,showell/zulip,mohsenSy/zulip,ryanbackman/zulip,cosmicAsymmetry/zulip,joyhchen/zulip,peguin40/zulip,zulip/zulip,souravbadami/zulip,jphilipsen05/zulip,jainayush975/zulip,souravbadami/zulip,reyha/zulip,Juanvulcano/zulip,Galexrt/zulip,j831/zulip,vabs22/zulip,vabs22/zulip,rht/zulip,umkay/zulip,sup95/zulip,PhilSk/zulip,amanharitsh123/zulip,sonali0901/zulip,christi3k/zulip,dawran6/zulip,j831/zulip,amyliu345/zulip,rht/zulip,sonali0901/zulip,KingxBanana/zulip,grave-w-grave/zulip,amyliu345/zulip,SmartPeople/zulip,hackerkid/zulip,PhilSk/zulip,ryanbackman/zulip,umkay/zulip,brainwane/zulip,rishig/zulip,dattatreya303/zulip,JPJPJPOPOP/zulip,SmartPeople/zulip,punchagan/zulip,amyliu345/zulip,ahmadassaf/zulip,dawran6/zulip,PhilSk/zulip,andersk/zulip,zacps/zulip,calvinleenyc/zulip,umkay/zulip,isht3/zulip,brainwane/zulip,arpith/zulip,kou/zulip,grave-w-grave/zulip,Diptanshu8/zulip,peguin40/zulip,paxapy/zulip,zacps/zulip,aakash-cr7/zulip,PhilSk/zulip,peguin40/zulip,vaidap/zulip,aakash-cr7/zulip,andersk/zulip,christi3k/zulip,jackrzhang/zulip,TigorC/zulip,vikas-parashar/zulip,grave-w-grave/zulip,punchagan/zulip,dhcrzf/zulip,dhcrzf/zulip,jrowan/zulip,kou/zulip,jphilipsen05/zulip,Galexrt/zulip,jackrzhang/zulip,isht3/zulip,jrowan/zulip,jainayush975/zulip,jphilipsen05/zulip,mohsenSy/zulip,cosmicAsymmetry/zulip,sup95/zulip,JPJPJPOPOP/zulip,umkay/zulip,dattatreya303/zulip,Galexrt/zulip,eeshangarg/zulip,calvinleenyc/zulip,amanharitsh123/zulip,verma-varsha/zulip,krtkmj/zulip,eeshangarg/zulip,AZtheAsian/zulip,Jianchun1/zulip,KingxBanana/zulip,blaze225/zulip,mohsenSy/zulip,Galexrt/zulip,brainwane/zulip,paxapy/zulip,calvinleenyc/zulip,TigorC/zulip,jainayush975/zulip,vikas-parashar/zulip,JPJPJPOPOP/zulip,joyhchen/zulip,TigorC/zulip,rishig/zulip,niftynei/zulip,AZtheAsian/zulip,peguin40/zulip,blaze225/zulip,punchagan/zulip,SmartPeople/zulip,jrowan/zulip,hackerkid/zulip,blaze225/zulip,reyha/zulip,zulip/zulip,KingxBanana/zulip,isht3/zulip,j831/zulip,christi3k/zulip,j831/zulip,mahim97/zulip,AZtheAsian/zulip,punchagan/zulip,reyha/zulip,tommyip/zulip,christi3k/zulip,sup95/zulip,samatdav/zulip,zulip/zulip,susansls/zulip,souravbadami/zulip,vaidap/zulip,amanharitsh123/zulip,paxapy/zulip,krtkmj/zulip,vaidap/zulip,jackrzhang/zulip,zacps/zulip,shubhamdhama/zulip,Jianchun1/zulip,sup95/zulip,eeshangarg/zulip,calvinleenyc/zulip,jackrzhang/zulip,punchagan/zulip,andersk/zulip,shubhamdhama/zulip,ahmadassaf/zulip,eeshangarg/zulip,Galexrt/zulip,tommyip/zulip,verma-varsha/zulip,showell/zulip,dawran6/zulip,dattatreya303/zulip,niftynei/zulip,verma-varsha/zulip,arpith/zulip,AZtheAsian/zulip,aakash-cr7/zulip,andersk/zulip,j831/zulip,joyhchen/zulip,vikas-parashar/zulip,krtkmj/zulip,dhcrzf/zulip,susansls/zulip,brainwane/zulip,krtkmj/zulip,tommyip/zulip,arpith/zulip,zulip/zulip,niftynei/zulip,peguin40/zulip,ahmadassaf/zulip,aakash-cr7/zulip,ryanbackman/zulip,timabbott/zulip,jainayush975/zulip,verma-varsha/zulip,amanharitsh123/zulip,hackerkid/zulip,isht3/zulip,SmartPeople/zulip,vaidap/zulip,Galexrt/zulip,grave-w-grave/zulip,sonali0901/zulip,shubhamdhama/zulip,blaze225/zulip,verma-varsha/zulip,hackerkid/zulip,tommyip/zulip,brockwhittaker/zulip,dhcrzf/zulip,cosmicAsymmetry/zulip,umkay/zulip,arpith/zulip,vabs22/zulip,peguin40/zulip,blaze225/zulip,Diptanshu8/zulip,jainayush975/zulip,mahim97/zulip,hackerkid/zulip,vaidap/zulip,rht/zulip,shubhamdhama/zulip,mohsenSy/zulip,jackrzhang/zulip,niftynei/zulip,dawran6/zulip,umkay/zulip,krtkmj/zulip,j831/zulip,synicalsyntax/zulip