0.3.0 Snake and Space Invaders!

Added Snake and a (half) working version of Space Invaders

Snake:
--> Food will spawn randomly in an area
--> if you touch the edge or yourself, you'll die 
--> game over animation where you can choose to go back to the main menu or restart
IMPORTANT: This game does not have controller support and if you go backwards if your snake is more than 2 long then you'll go game over

Space Invaders:
--> There will spawn rows of invaders and you need to shoot them
--> Invaders will go a little bit faster each time you'll kill one
--> Invaders will shoot back
--> you can only shoot one bullet at a time
--> Controller support (joystick for moving and A for shooting, Xbox)
IMPORTANT: This game is not complete and if you miss the invaders you can't shoot anymore, there also is not a game over.

Main Menu:
-->added a Snake button to play Snake
-->added a Space Invaders button to play Space Invaders