Add Game and Player class as well as basic graphics, player movement, (nyi) game states and some basic functions for e.g. collision detection, range checks, randomizing integers.
Implement level loading and add a level textfile. Also delete player in Game deconstructor and slightly adjust the camera.
Implement debug info text (turned on/off by pressing F3) which shows FPS, mouse position and players position. Implemented losing/gaining focus based pausing. Implement game over state when hitting a gameobject/wall (pressing Enter re-starts the game). The player will no longer be able to move when gameState is not STATE_PLAYING. Added two fonts.