[Keyboard] Doro67 Multi PCB port (#5539)

[Keyboard] Doro67 Multi PCB port (#5539)

* Initial portover of the doro68.json with corrected column pins.

* Initial setup of LAYOUT_ansi and it's use in the default keymap.

* Added F keys to default kemap on layer 1.

* Added split space (and everything else) layout and a base keymap to be updated.

* Renamed split_space to multi.

* Changed product_id for doro.

* Created a basic doro LAYOUT_iso and default keymap.

* Copied over basic layout and keymap.

* Added readme.md for doro67 multi.

* Removed basic keyboad layout and keymap because it's a separate PCB.

* Added backlight controls to the various keymaps.

* Added explicit backlight pin define.

* Increased number of backlight levels for flexibility.

* Removed unnecessary line slashes and unified keymcaps.

* Corrected ISO layout and switched position with multi.

* Added keymap readme.md files.

* Corrected ISO keymap.

* Added Layouts to info.json for toolbox.

* Re-added slashes as they were necessary here...

* Corrected info.json/keymap discreptancies.

* Updated copyright messages (and fixed small readme error).

* Added missing line break spaces in readme.md

Co-Authored-By: ShadeDream <nick@shadedream.com>
* Keymap alignments on default_multi readme.md

Co-Authored-By: ShadeDream <nick@shadedream.com>
* Keymap alignments on default_multi readme.md

Co-Authored-By: ShadeDream <nick@shadedream.com>
* Keymap alignments on default_multi readme.md

Co-Authored-By: ShadeDream <nick@shadedream.com>
* Small alignment adjustment on the default keymap readme.md

Co-Authored-By: ShadeDream <nick@shadedream.com>