Add Projectile
Create a Projectile when the player is attacking
Move projectiles
Shoot projectiles in the direction the player is facing
Fix Player
Put Player#touches in a more abstract version into GameLogic
Collide projectiles with walls
Collide projectiles with borders
Projectiles damage players
Do not damage the source with it's own projectile
Destroy dead enemies
Inflict damange on enemies
Shoot projectiles from the hip
Update level
Merge branch 'projectiles'