Many small fixes, corrections, removed comments and cut debug output
Windows are no longer registered in the ui manager (they won't appear when modifying the ui)
Windows' settings are no longer saved as it wasn't necessary anyway
Pairs: Picked (but not completed) cards will reset when leaving the game or reloading the ui (you no longer have to remember that single picture that's already turned as the first card).
New Game: Tic-Tac-Toe
Known caveats
Missing userfriendly launch interface
Missing difficulty/playfield settings
No multiplayer support (yet)
The algorithm used for Tic-Tac-Toe is far from being perfect, suggestions are welcome!
