This brings this naming into consistency with both fellow consts in the
same file (ex. LeaderMode is singular) as well as the variables in which
the consts are usually used (usually a `Firmware.unicode_mode` attribute
in a keymap).
This took a bit of brain surgery to firmware.py that deserves its own
commit message beyond the default merge commit message - tl;dr though,
it appears to work fine.
This allows leader sequences to "time out" rather than requiring an
Enter keypress to end.
This also rolls back some unnecessary changes from #72 to the matrix
scanner for performance reasons.
In theory we can use this in the future for Tap Dance support (#40)
Resolves#1Resolves#37
Resolves#70, Resolves#67
Still needs some regression testing in general, and a definite
regression is that rotary encoders are no longer (for the immediate time
being) supported.
Moves to a much simpler internal state tracking system, and FAR lighter
matrix scan.
Removes MicroPython support entirely.
