Update 2! Hard Times, Easy Times

Changes:

- Added a difficulty chooser for more diversity

- Added a new enemy! Meet the fast, the tanky 'Ftang!'

- Removed Sprinting

- updated some ui to look cleaner

- Fixed A Bug with the player's Health bar not showing the correct amount

- Fixed the delay on a xp pickup

- More balancing

- little bug fixes

Sprinting was too OP and defeated the purpose of the speed power-up.