[Keymap] Drashna updates for 0.19 (#19175)

* 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

keyboards/keebio/viterbi/keymaps/drashna/keymap.c

@@ -74,13 +74,3 @@ bool process_record_keymap(uint16_t keycode, keyrecord_t *record) {
     //}
     return true;
 }
-
-void matrix_init_keymap(void) {
-#ifndef CONVERT_TO_PROTON_C
-    setPinOutput(D5);
-    writePinHigh(D5);
-
-    setPinOutput(B0);
-    writePinHigh(B0);
-#endif
-}

keyboards/keebio/viterbi/keymaps/drashna/rules.mk

@@ -21,4 +21,5 @@ LAYOUTS = ortho_5x7
 # SRC := $(filter-out split_util.c,$(SRC))
 # SRC += quantum/matrix.c
 
-BOOTLOADER        = qmk-dfu
+BOOTLOADER        = qmk-hid
+BOOTLOADER_SIZE   = 512