* `KC_PGDOWN` -> `KC_PGDN` * `KC_PSCREEN` -> `KC_PSCR` * `KC_SCOLON` -> `KC_SCLN` * `KC_BSLASH` -> `KC_BSLS` * `KC_BSPACE` -> `KC_BSPC`
* Remove legacy USE_SERIAL define * tidy up missed comments