## Link to GitHub Issue or related Pull Request, if one exists
related to #697
## Description of change
Add a new option that paints touch targets and touch points for jubeat;
gets enabled if there is a touch screen connected. This is to help
explain / debug issues when users have their touch screen issues, which
is usually due to misalignment.
Fix the touch targets being off by 1 pixel (center gap is 1px wider in
both directions).
Also, simplify the `improved` algorithm to simulate a finger and trigger
nearest-neighbor for the AC dimensions. In terms of touch performance
this is near identical to what we had before, but it allows us to draw a
nice debug overlay instead of just grids.
## Testing
Tested portrait and landscape versions of jb.
