Removed useless message
Moved all the LoadModel-methods for structures into the LevelParser

Also moved the PlayerUpdate-part to update after all the other methods
Now only loads the needed models
Added a "IsGameOver"-method
Updated Player
Fixed PlayScreen to print the GUI into each players viewport. (It now works with splitscreen)
Added PostPlayScreen, i.e. "Game Over" screen
Updated PlayerUnit so it can die (To test new screen)