Resurrect Keychron K12

[turai]

Description

Nothing special, just ported k12 from the old branch.

Types of Changes

• [ ] Core
• [ ] Bugfix
• [x] New feature
• [ ] Enhancement/optimization
• [x] Keyboard (addition or update)
• [x] Keymap/layout/userspace (addition or update)
• [ ] Documentation

Checklist

• [x] My code follows the code style of this project: C, Python
• [x] I have read the PR Checklist document and have made the appropriate changes.
• [ ] My change requires a change to the documentation.
• [ ] I have updated the documentation accordingly.
• [x] I have read the CONTRIBUTING document.
• [ ] I have added tests to cover my changes.
• [x] I have tested the changes and verified that they work and don't break anything (as well as I can manage).

[turai]

I saw in mainline they consider all non-character keys as modifiers. It doesn't make much sense to me, but the flags were changed accordingly.

For example if you search repo:qmk/qmk_firmware rgb_matrix lang:json these come up: https://github.com/qmk/qmk_firmware/blob/5acc3b2b7b13e6057623091a4bced7b1d9e76cdb/keyboards/keychron/q2/iso/keyboard.json#L8

[dexter93]

I saw in mainline they consider all non-character keys as modifiers. It doesn't make much sense to me, but the flags were changed accordingly.

For example if you search repo:qmk/qmk_firmware rgb_matrix lang:json these come up: https://github.com/qmk/qmk_firmware/blob/5acc3b2b7b13e6057623091a4bced7b1d9e76cdb/keyboards/keychron/q2/iso/keyboard.json#L8

that's correct. You can see the result on Alpha Mods RGB animation