Say Cheese V.03

- Adjusted jump height and player gravity
- Added Main Menu
- Added Highscore
- Exploding enemy should now trigger the explosion for another exploding enemy
- Points now correctly added when an exploding enemy explodes an exploding enemy
- Adjusted projectile speed and lifetime to reduce the chance of shooting at an enemy before you see it and killing them
- First exploding enemy should now spawn exactly at 25 points
- Adjusted spawning range for base and exploding enemy