Backlight abstraction and other changes (#439)

* redoes matrix pins, abstracts backlight code for B5,6,7

* slimming down keyboard stuff, backlight breathing implemented

* don't call backlight init when no pin

* cleans up user/kb/quantum calls, keyboard files

* fix pvc atomic

* replaces CHANNEL with correct var in breathing

* removes .hexs, updates readmes, updates template

* cleans-up clueboards, readmes to lowercase

* updates readme

keyboards/kc60/keymaps/stanleylai/readme.md

@@ -0,0 +1,26 @@
+Stanley Lai's Split Right Shift with Dedicated Arrow Keys
+======================
+
+![Image of KC60 with RGB Underglow](../ws2812/ws2812_example.jpg)
+
+## Quantum MK Firmware
+For the full Quantum feature list, see [the parent readme.md](/readme.md).
+
+## Keymap Notes
+- Keymap setup with split Right Shift in mind.
+- Right-side modifiers are setup as dedicated arrow keys
+
+### Base Layer Reference
+- Fn Layer indicated on keycap front legends.
+- Tapping Caps Lock key toggles Caps. Holding it down momentarily switches us to the Fn Layer.
+- Holding down "Fn" and "Page Down" momentarily switches us to the RGB Layer. Tapping "Page Down" behaves as expected.
+![Base Layer](base_layer.jpg)
+
+### RGB Layer Reference
+![RGB Layer](rgb_layer.jpg)
+
+## WS2812 Support
+By default, it is now setup for 16 LEDs on the PF5 breakout pin. See [included image](../ws2812/ws2812_wiring.jpg) for wiring reference.
+
+### Build
+To build this keymap, simply run `make KEYMAP=stanleylai`.