TODO's #22
Description
1. Make a game over thing that quits to main menu when ESC is hit
2. Make pieces auto fall at a speed based on the current level and move down every other frame if down is held
3. Implement DAS left and right (difficult)
4. Level up on enough line clears and make text appear for lines cleared and for current level
5. Make the Vec<ControlScheme> be stored as part of Control so that it survives after each game (or maybe store the other type that is used to build that)
6. Implement GamePads (see gilrs)
7. Config file to hold the control schemes
8. Save file to hold scores (and replays someday?)
9. Fix yet another line clearing bug (2 tetrises scored one right after the other, but not after the clear delay is up for the first)
10. Make pieces random
11. Fix weird thing with saving controls
12. Test DAS more and make sure that it's right
13. Add changelog file