Added car HP + zones for healing + high scores + bug fixes

Added High Scores

• This is the initial implementation of high scores
• Still To do: saving high scores between sessions, allowing player name input. Coming soon!

Added Car Hit Points (HP)

• Hit Points (HP) drain when you hit the wall
• The car also loses power when you hit the wall
• Lose enough HP and your engine power will be permanently reduced

Added random healing zones that may or may not spawn on each tile. 

• Driving through them regenerated car Car HP AND Boost

Bug Fix

• The new values set in the Car Customizer values would be overwritten after 1 frame! Whoops. It works now. There are a few other values to expose in the customizer, I'll add those soon.