Keyboard: Add 412 64 Model 00 keyboard. (#4400)

Keyboard: Add 412 64 Model 00 keyboard. (#4400)

* Add 412-64 keyboard firmware

It's pretty barebones for now, but the Model 00 is also a pretty barebones machine. Model 01 won't be better, but plenty of pins exist for things like LEDs on Model 02.

* MANU/PROD ID changes.

Changed around the MANUFACTURER and PRODUCT IDs to be more polite when viewed in qmk toolbox.

* Fixing PROD again.

For the love of all that is good and holy, that was ugly. This new one looks better. This stuff matters to me for some reason.

* Yep, updating MANU again.

There we go. That's better - From my name to my "design firm".

* Update keyboards/412_64/keymaps/default/keymap.c

Co-Authored-By: FateEverywhere <41215461+FateEverywhere@users.noreply.github.com>
* Update keyboards/412_64/rules.mk

Co-Authored-By: FateEverywhere <41215461+FateEverywhere@users.noreply.github.com>
* Update keyboards/412_64/rules.mk

Co-Authored-By: FateEverywhere <41215461+FateEverywhere@users.noreply.github.com>
* Update keyboards/412_64/rules.mk

Co-Authored-By: FateEverywhere <41215461+FateEverywhere@users.noreply.github.com>
* Update keyboards/412_64/rules.mk

Co-Authored-By: FateEverywhere <41215461+FateEverywhere@users.noreply.github.com>