Test per-game chat. Breaks global chat.
Display Per-game chat messages in the correct tab

Errors are displayed in all chat tabs, including the global chat and
all in-game chats.
Send game ID to client for in-game chat
Remove the chat tab when leaving a game
Fix up per-game chats so global chat still works. Fix graphical glitch with game chat tab. Make enter work in game chat box. Clear game chat log when joinging game.