Added HUD, game now playable

HUD
- Fully complete
- Title, game over and restart messages
- Score counter
- Bomb counter

Blocks
- Added ability to spawn multiple blocks per wave
- Blocks now cycle through the food items rather than randomize
- Blocks cleared from game on restart

Removed redundant BottomBoundary class

Added bombs
- Currently don't do anything to gameplay

Game
- Player now earns score
- Game has menu, game over and restart
- Player now dies when pushed off stage