General Game Feel Improvements

Here are the things I readded or added

1. difficulty settings

2. Special hit effects

3. more sounds.

4. beaver cutscene

5. spin dash(dash while spinning)

6. holding different buttons give different moves

7. graphical fixes

8. Boss-Rush up to 3 bosses

9. C/right click to crouch now

10. hit the slot machine spinner twice now

11. 'hit me' heads up display