[Keymap] Assorted personal keymap/userspace updates (#6691)

[Keymap] Assorted personal keymap/userspace updates (#6691)

* Turn off more unnecessary features by default

* Double TAP_CODE_DELAY due to more media key issues

Even with this change, some of the rotary encoder turns on my BDN9's
volume knob still seem to get dropped. It's possible there's something
wrong with the encoder itself. (Maybe the TAP_CODE_DELAY actually causes
QMK to miss an encoder turn? Unclear.) The other knob (backlight
brightness) works fine, FWIW....

* Restructure userspace config.h a bit

* Hack around Instant60 Via EEPROM conflict

Remove this when #6589 is fixed for Via boards.

* Add backlight breathing and (EEPROM) reset to BDN9

* Add keymap for 9-Key macropad