Complete rewrite of player movement and controls

• Throwing a snowball will now stop the character from moving while throwing it
• You cannot glide while on the ground now
• You can throw a snowball while in the air now.

Health

• Added health to the player and slimes
  
• The player will flash red when hit, when will lose a heart
  
• 
  

Gem Completion

• To move to the next level you have to collect all the gems in the current level then proceed to the exit (Currently only one level, so it just restarts the level)