Simplify code

Add direct message server command (/msg <nick_name>|<[nick name]> <message>)

Add some work towards having checker work with the new server

Add replay storage to the new server implementation

Fix a couple issues

Change the next major release version number to 1.1.0

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.