OptionScreen no longer crashes when no items are available
All option screens now have a title which will be displayed at the top
Implement additional UDP connection on same port between client <> server.

Proof of concept containing:
- UDP Packets are linked to client sockets using random 64bit keys.
- UDP Packets have a sequence field, as the time can still yields collisions.
- Sequence fields are checked, and the short field is handled correctly with overflows.
- Only the SetPlayerData command is now transmitted over UDP.

Todo:
- Lag is not calculated on the UDP connection, but on the TCP connection.
- Calculate packet loss, and show indicator somewhere just like with FPS.
Merge pull request #19 from rayburgemeestre/network_multiplayer

Implement additional UDP connection on same port between client <> server
Fixed an include
Renamed connect to select server in client settings menu
The start button can now be used to select items in menus
Start button now quits in stead of unpauses when quit is selected
Renamed multiplayer to play local and online to play online in main menu
Fixed laser beam offset
Bomb sprite no longer cut off on the bottom
Fixed explosion offset for mines
changed bomb sprite, added magenta hightlight for menu
Altered sprites for titlescreen