Fix out-of-bounds problem in TClass::EscapeChars
Fix out-of-bounds problem in TClass::EscapeChars

Increase the maximum size to 255 and make sure that the new, expanded string fix in the fixed length buffer.
This fixes ROOT-6239

sbinet/cxx-root,zzxuanyuan/root,omazapa/root,gbitzes/root,satyarth934/root,sirinath/root,omazapa/root-old,evgeny-boger/root,perovic/root,davidlt/root,thomaskeck/root,mkret2/root,vukasinmilosevic/root,vukasinmilosevic/root,bbockelm/root,abhinavmoudgil95/root,bbockelm/root,omazapa/root,krafczyk/root,zzxuanyuan/root,omazapa/root,gbitzes/root,mattkretz/root,BerserkerTroll/root,simonpf/root,krafczyk/root,gbitzes/root,davidlt/root,Y--/root,perovic/root,jrtomps/root,sawenzel/root,mattkretz/root,evgeny-boger/root,olifre/root,sawenzel/root,satyarth934/root,mkret2/root,gganis/root,omazapa/root-old,olifre/root,sirinath/root,vukasinmilosevic/root,simonpf/root,Duraznos/root,agarciamontoro/root,0x0all/ROOT,mkret2/root,BerserkerTroll/root,krafczyk/root,simonpf/root,veprbl/root,abhinavmoudgil95/root,smarinac/root,buuck/root,Duraznos/root,esakellari/my_root_for_test,karies/root,perovic/root,gganis/root,BerserkerTroll/root,agarciamontoro/root,BerserkerTroll/root,omazapa/root,CristinaCristescu/root,gbitzes/root,Duraznos/root,agarciamontoro/root,arch1tect0r/root,beniz/root,pspe/root,CristinaCristescu/root,satyarth934/root,gbitzes/root,beniz/root,perovic/root,georgtroska/root,smarinac/root,esakellari/my_root_for_test,esakellari/root,thomaskeck/root,mhuwiler/rootauto,mattkretz/root,georgtroska/root,0x0all/ROOT,arch1tect0r/root,zzxuanyuan/root,jrtomps/root,olifre/root,beniz/root,esakellari/my_root_for_test,georgtroska/root,root-mirror/root,davidlt/root,gganis/root,Y--/root,buuck/root,krafczyk/root,zzxuanyuan/root,davidlt/root,BerserkerTroll/root,karies/root,zzxuanyuan/root,omazapa/root,perovic/root,karies/root,karies/root,omazapa/root,vukasinmilosevic/root,vukasinmilosevic/root,agarciamontoro/root,abhinavmoudgil95/root,buuck/root,esakellari/root,georgtroska/root,mkret2/root,lgiommi/root,gbitzes/root,veprbl/root,karies/root,gganis/root,gganis/root,BerserkerTroll/root,olifre/root,davidlt/root,dfunke/root,perovic/root,mkret2/root,sirinath/root,zzxuanyuan/root-compressor-dummy,agarciamontoro/root,root-mirror/root,bbockelm/root,davidlt/root,buuck/root,vukasinmilosevic/root,simonpf/root,omazapa/root-old,esakellari/root,simonpf/root,beniz/root,bbockelm/root,zzxuanyuan/root-compressor-dummy,thomaskeck/root,satyarth934/root,zzxuanyuan/root,mhuwiler/rootauto,buuck/root,bbockelm/root,esakellari/root,sawenzel/root,perovic/root,dfunke/root,veprbl/root,vukasinmilosevic/root,omazapa/root-old,mattkretz/root,mhuwiler/rootauto,veprbl/root,georgtroska/root,davidlt/root,pspe/root,omazapa/root-old,karies/root,mhuwiler/rootauto,nilqed/root,olifre/root,esakellari/my_root_for_test,Y--/root,mattkretz/root,smarinac/root,omazapa/root,0x0all/ROOT,evgeny-boger/root,zzxuanyuan/root,perovic/root,sawenzel/root,abhinavmoudgil95/root,mattkretz/root,sirinath/root,arch1tect0r/root,sbinet/cxx-root,gganis/root,veprbl/root,esakellari/my_root_for_test,satyarth934/root,krafczyk/root,CristinaCristescu/root,omazapa/root,buuck/root,gganis/root,olifre/root,krafczyk/root,simonpf/root,dfunke/root,root-mirror/root,arch1tect0r/root,sbinet/cxx-root,mkret2/root,smarinac/root,evgeny-boger/root,jrtomps/root,dfunke/root,vukasinmilosevic/root,sawenzel/root,olifre/root,arch1tect0r/root,gganis/root,mhuwiler/rootauto,sawenzel/root,nilqed/root,CristinaCristescu/root,simonpf/root,sbinet/cxx-root,olifre/root,dfunke/root,perovic/root,zzxuanyuan/root-compressor-dummy,root-mirror/root,georgtroska/root,arch1tect0r/root,gbitzes/root,gbitzes/root,arch1tect0r/root,sirinath/root,smarinac/root,root-mirror/root,davidlt/root,mattkretz/root,satyarth934/root,karies/root,lgiommi/root,esakellari/root,smarinac/root,jrtomps/root,thomaskeck/root,jrtomps/root,pspe/root,zzxuanyuan/root,beniz/root,beniz/root,satyarth934/root,nilqed/root,Duraznos/root,karies/root,Duraznos/root,sbinet/cxx-root,sirinath/root,sirinath/root,0x0all/ROOT,zzxuanyuan/root-compressor-dummy,nilqed/root,0x0all/ROOT,thomaskeck/root,nilqed/root,krafczyk/root,Y--/root,jrtomps/root,sbinet/cxx-root,smarinac/root,evgeny-boger/root,sirinath/root,omazapa/root-old,mhuwiler/rootauto,arch1tect0r/root,evgeny-boger/root,zzxuanyuan/root,sawenzel/root,omazapa/root-old,agarciamontoro/root,veprbl/root,mattkretz/root,zzxuanyuan/root,mkret2/root,abhinavmoudgil95/root,lgiommi/root,root-mirror/root,CristinaCristescu/root,0x0all/ROOT,pspe/root,esakellari/root,arch1tect0r/root,simonpf/root,sirinath/root,BerserkerTroll/root,mhuwiler/rootauto,nilqed/root,dfunke/root,sawenzel/root,bbockelm/root,thomaskeck/root,mhuwiler/rootauto,sawenzel/root,Y--/root,BerserkerTroll/root,lgiommi/root,krafczyk/root,dfunke/root,beniz/root,evgeny-boger/root,Duraznos/root,beniz/root,BerserkerTroll/root,arch1tect0r/root,esakellari/root,agarciamontoro/root,esakellari/my_root_for_test,esakellari/root,buuck/root,dfunke/root,pspe/root,pspe/root,CristinaCristescu/root,nilqed/root,buuck/root,gbitzes/root,georgtroska/root,zzxuanyuan/root-compressor-dummy,0x0all/ROOT,veprbl/root,dfunke/root,0x0all/ROOT,satyarth934/root,lgiommi/root,BerserkerTroll/root,davidlt/root,pspe/root,nilqed/root,evgeny-boger/root,vukasinmilosevic/root,vukasinmilosevic/root,simonpf/root,satyarth934/root,thomaskeck/root,jrtomps/root,esakellari/root,Duraznos/root,beniz/root,vukasinmilosevic/root,agarciamontoro/root,omazapa/root-old,jrtomps/root,georgtroska/root,Y--/root,beniz/root,esakellari/my_root_for_test,satyarth934/root,abhinavmoudgil95/root,sawenzel/root,sbinet/cxx-root,agarciamontoro/root,sbinet/cxx-root,omazapa/root,zzxuanyuan/root-compressor-dummy,Y--/root,root-mirror/root,nilqed/root,krafczyk/root,karies/root,mhuwiler/rootauto,CristinaCristescu/root,bbockelm/root,esakellari/my_root_for_test,sbinet/cxx-root,jrtomps/root,esakellari/root,olifre/root,mhuwiler/rootauto,lgiommi/root,mkret2/root,veprbl/root,nilqed/root,abhinavmoudgil95/root,bbockelm/root,0x0all/ROOT,sbinet/cxx-root,Duraznos/root,evgeny-boger/root,veprbl/root,thomaskeck/root,zzxuanyuan/root-compressor-dummy,CristinaCristescu/root,thomaskeck/root,thomaskeck/root,omazapa/root,karies/root,zzxuanyuan/root-compressor-dummy,davidlt/root,mkret2/root,CristinaCristescu/root,gganis/root,gbitzes/root,bbockelm/root,davidlt/root,CristinaCristescu/root,perovic/root,Y--/root,veprbl/root,lgiommi/root,esakellari/my_root_for_test,georgtroska/root,zzxuanyuan/root,zzxuanyuan/root-compressor-dummy,georgtroska/root,perovic/root,lgiommi/root,zzxuanyuan/root,CristinaCristescu/root,lgiommi/root,nilqed/root,mattkretz/root,lgiommi/root,mattkretz/root,omazapa/root-old,gganis/root,pspe/root,bbockelm/root,bbockelm/root,abhinavmoudgil95/root,olifre/root,smarinac/root,esakellari/root,dfunke/root,beniz/root,sirinath/root,jrtomps/root,omazapa/root-old,sawenzel/root,buuck/root,krafczyk/root,omazapa/root,buuck/root,Y--/root,evgeny-boger/root,evgeny-boger/root,simonpf/root,abhinavmoudgil95/root,Y--/root,mattkretz/root,karies/root,Y--/root,gganis/root,gbitzes/root,zzxuanyuan/root-compressor-dummy,mhuwiler/rootauto,mkret2/root,abhinavmoudgil95/root,sbinet/cxx-root,abhinavmoudgil95/root,esakellari/my_root_for_test,pspe/root,smarinac/root,agarciamontoro/root,Duraznos/root,pspe/root,lgiommi/root,georgtroska/root,buuck/root,dfunke/root,sirinath/root,mkret2/root,jrtomps/root,root-mirror/root,arch1tect0r/root,root-mirror/root,BerserkerTroll/root,agarciamontoro/root,root-mirror/root,omazapa/root-old,zzxuanyuan/root-compressor-dummy,root-mirror/root,satyarth934/root,smarinac/root,veprbl/root,olifre/root,Duraznos/root,krafczyk/root,pspe/root,Duraznos/root,simonpf/root