Known issues
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- Negative cursor positions unsupported
- Positive scroll values unsupported
- Hitting Reset in app that uses windows and desktop (no mouse needed) seems to mess up screen holes for Disk II
- Mashing a button with mouse in Applesoft will cause Undefined Statement error
- Repainting a view while the mouse cursor is on it will cause artifacts when mouse moves
- Quitting sometimes leaves BASIC in inverted text mode
- Quitting with button highlighted leaves us in inverted text mode

To Do:
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- Make WGFillRect support 1 height and 1 width
- If called in inverse mode, clear screen clears inverse
- Fix unclosed PRE tags in documentation