Holy refactor, Batman: full layer support (MO/DF)

Wow, what a trip this was. Layer support is now fully implemented. Other
changes here mostly revolve around the event dispatching model: more
floating state (hidden in clases wherever) has been purged, with the
reducer (now mutable, comments inline) serving, as it should, as the
sole source of truth. Thunk support has been added to our fake Redux
clone, allowing Action Creators to handle sequences of events (which is
arguably a cleaner way of handling matrix changes when not all matrix
changes should result in a new HID report - in the case of internal
keys). A whole class has been deprecated (Keymap) which only served as
another arbitor of state: instead, the MatrixScanner has been made
smarter and handles diffing internally, dispatching an Action when
needed (and allowing the reducer to parse the keymap and figure out what
key is pressed - this is the infinitely cleaner solution when layers
come into play).

kmk/common/internal_keycodes.py

@@ -4,53 +4,41 @@ from kmk.common.event_defs import KEY_DOWN_EVENT, KEY_UP_EVENT
 from kmk.common.keycodes import Keycodes
 
 
-def process(state, action, logger=None):
-    if action['keycode'].code < 1000:
-        return state
-
+def process_internal_key_event(state, action, changed_key, logger=None):
     if logger is None:
         logger = logging.getLogger(__name__)
 
-    logger.warning(action['keycode'])
-    if action['keycode'] == Keycodes.KMK.KC_RESET:
-        return reset(state, action, logger=logger)
-    elif action['keycode'].code == Keycodes.Layers._KC_DF:
-        return df(state, action, logger=logger)
-    elif action['keycode'].code == Keycodes.Layers._KC_MO:
-        return tilde(state, action, logger=logger)
-    elif action['keycode'].code == Keycodes.Layers.KC_TILDE:
+    if changed_key.code == Keycodes.Layers._KC_DF:
+        return df(state, action, changed_key, logger=logger)
+    elif changed_key.code == Keycodes.Layers._KC_MO:
+        return mo(state, action, changed_key, logger=logger)
+    elif changed_key.code == Keycodes.Layers.KC_TILDE:
         pass
     else:
         return state
 
 
-def tilde(state, action, logger):
+def tilde(state, action, changed_key, logger):
     # TODO Actually process keycodes
     return state
 
 
-def reset(state, action, logger):
-    logger.debug('Rebooting to bootloader')
-    import machine
-    machine.bootloader()
-
-
-def df(state, action, logger):
+def df(state, action, changed_key, logger):
     """Switches the default layer"""
-    state.active_layers[0] = action['keycode'].layer
+    state.active_layers[0] = changed_key.layer
 
     return state
 
 
-def mo(state, action, logger):
+def mo(state, action, changed_key, logger):
     """Momentarily activates layer, switches off when you let go"""
     if action['type'] == KEY_UP_EVENT:
         state.active_layers = [
             layer for layer in state.active_layers
-            if layer != action['keycode'].layer
+            if layer != changed_key.layer
         ]
     elif action['type'] == KEY_DOWN_EVENT:
-        state.active_layers.append(action['keycode'].layer)
+        state.active_layers.append(changed_key.layer)
 
     return state