OMEGA REFACTOR! Perf grind basically complete.

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.

kmk/kmktime.py

@@ -1,11 +1,7 @@
 import math
 
-try:
-    import utime as time
-    USE_UTIME = True
-except ImportError:
-    import time
-    USE_UTIME = False
+import time
+USE_UTIME = False
 
 
 def sleep_ms(ms):