* Fix up bastardkb boards since blackpill support is officially added.
* Check for blackpill version, not elite c.
* Add checks in chibiOS config since multiple ARM controllers supported.
* Rework rules.mk for keymaps to better handle arm vs avr support
* Start moving away from `matrix_*_*` functions.
* `housekeeping_task_*` instead of `matrix_scan_*`
* `keyboard_(pre|post)_init_*` instead of `matrix_init_*`
* Add ℂℴmⅈℂ unicode input method.
* Clean up unicode code to be more compact and flexible.
* Remove/move Pro Micro LED commands to userspace and better filter them
* Fixup OLED code
* Use newer quantum keycode functions/preprocessors rather than manual bit manipulation
* Make unicode mode render much more compact/simple.
* Make qmk secrets more self contained
* Remove custom implementation of split watchdog
Nick Brassel
Drashna Jaelre
Stefan Kerkmann