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/boards/klarank.py

@@ -0,0 +1,18 @@
+from kmk.consts import DiodeOrientation
+from kmk.mcus.circuitpython_samd51 import Firmware as _Firmware
+from kmk.pins import Pin as P
+
+
+class Firmware(_Firmware):
+    # physical, visible cols (SCK, MO, MI, RX, TX, D4)
+    # physical, visible rows (10, 11, 12, 13) (9, 6, 5, SCL)
+    col_pins = (P.SCK, P.MOSI, P.MISO, P.RX, P.TX, P.D4)
+    row_pins = (P.D10, P.D11, P.D12, P.D13, P.D9, P.D6, P.D5, P.SCL)
+    rollover_cols_every_rows = 4
+    diode_orientation = DiodeOrientation.COLUMNS
+
+    swap_indicies = {
+        (3, 3): (3, 9),
+        (3, 4): (3, 10),
+        (3, 5): (3, 11),
+    }