Allow to see rooms of incompatible versions in the lobby
For the new clients the room version is shown in a separate column.
There is also a hack for previous versions clients: the room vesion
specifier is prepended to the room names for rooms of incompatible versions,
and the server shows 'incompatible version' error if the client tries to join them.
[patterns]
**.h = native
**.c = native
**.cpp = native
**.lua = native
**.txt = native
**.pas = native
**.inc = native
**.hs = native