Chat messages are now printed to console in color

* Removed RemoveColorMarkup function (no longer used)
* Chat messages are now printed to console in CBaseHudChatLine::Colorize
Added auto-complete to "give" ConCommand
Updated prefixes and re-added item_suit hack
Merge remote-tracking branch 'origin/autocomplete-give'
Merge remote-tracking branch 'origin/chat-color'