feat (privatechat): prevent duplicate usernames
feat (privatechat): prevent duplicate usernames

fuzzwizard/builders-game,Hrr-19-crushers/builders-game,Hrr-19-crushers/builders-game,Numose/builders-game,fuzzwizard/builders-game,Hrr-19-crushers/builders-game,fuzzwizard/builders-game,Numose/builders-game,Numose/builders-game