core: add css user select protection
core: add css user select protection

clappr/clappr,dayvson/clappr,tarkanlar/clappr,irongomme/clappr,clappr/clappr,burakkp/clappr,tjenkinson/clappr,shakin/clappr,Peer5/clappr,Peer5/clappr,jfairley/clappr,shakin/clappr,Peer5/clappr,tjenkinson/clappr,irongomme/clappr,kelonye/clappr,jfairley/clappr,jfairley/clappr,flavioribeiro/clappr,burakkp/clappr,flavioribeiro/clappr,dayvson/clappr,MariadeAnton/clappr,flavioribeiro/clappr,MariadeAnton/clappr,burakkp/clappr,tjenkinson/clappr,kelonye/clappr,shakin/clappr,wxmfront/clappr,irongomme/clappr,dayvson/clappr,Metrakit/clappr,leandromoreira/clappr,Pyrotoxin/clappr,wxmfront/clappr,clappr/clappr,Metrakit/clappr,Pyrotoxin/clappr,wxmfront/clappr,tarkanlar/clappr,tarkanlar/clappr,MariadeAnton/clappr,Pyrotoxin/clappr,Metrakit/clappr,kelonye/clappr,leandromoreira/clappr,leandromoreira/clappr