A few more fixes to make it shine

Hello again,

I get the impression I already used every possible bugfix announcement phrase at least once. I should stop maintaining this game :-)

Changes:

• Added a little splash screen while the game is starting up
• Fixed the shoot button mixup in Multiplayer
• Fixed the weird default XBox360 controller setup
• Fixed the global illumination in the Multiplayer Test level

Unfortunately this also means that if you are using a XBox360 controller, your control setup is mixed up now. You have to manually remap the movement and aim controls to make it work again. Sorry for that. I promise it's the last time that this is happening.