Change in how duplicate names are handled in netgames

When there are clients trying to join a netgame which contains another client with the same name, the game will append a parenthesis with a unique digit to the new player's name.

If the name is above the player name limit, characters will be truncated from the name to make room for the parenthesis.

i.e. A host and a client with the names "Sonic", if the client joins the host, the client's name turns into "Sonic (1)" etc.