* `DEBUG` -> `DB_TOGG`, default-ish keymaps * `DEBUG` -> `DB_TOGG`, user keymaps * `DEBUG` -> `DB_TOGG`, community layouts * `DEBUG` -> `DB_TOGG`, userspace * `DEBUG` -> `DB_TOGG`, docs & core
* `KC__VOLDOWN` -> `KC_VOLD` * `KC__VOLUP` -> `KC_VOLU` * `KC__MUTE` -> `KC_MUTE` * `KC_POWER` -> `KC_PWR`
* Remove legacy USE_SERIAL define * tidy up missed comments