[done] In-game chat - sound notification when mentioning someone's name

[uncle]

It would be great if a player was also notified by the same sound that is played in the lobby when is mentioned his/her name, also when the players is in a game room or in a started game.

Some players are AFK in game rooms and this would make it easier to let them know that they should get ready.

[softcoder]

Ok, this is now added in svn (for game lobby and in game)