Remove QMK_KEYBOARD_CONFIG_H

[zvecr]

Description

Given that all config.h files are automatically injected as part of the build process, this PR removes QMK_KEYBOARD_CONFIG_H which only functions some of the time.

Types of Changes

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

Checklist

• My code follows the code style of this project: C, Python
• 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.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• I have tested the changes and verified that they work and don't break anything (as well as I can manage).

[skullydazed]

Should probably leave this open a bit to give the involved people a heads up.

Pinging @losinggeneration @333fred @mtdjr @nooges @christopherjanzen @Talljoe @unxmaal @algernon @berfarah @issmirnov @jackhumbert @kejadlen @Townk

[losinggeneration]

Looks like my contra layout build has been long broken (bisect says since 4e9fb1d). I'll fix that at a later time. I don't see any issue with the nyquist or levinson builds and don't think the contra layout issue should hold up this PR.

[noroadsleft]

Looks like my contra layout build has been long broken (bisect says since 4e9fb1d). I'll fix that at a later time. I don't see any issue with the nyquist or levinson builds and don't think the contra layout issue should hold up this PR.

@losinggeneration At a glance, it looks like your CATMAP macro maps to LAYOUT through your userspace, but I deleted the LAYOUT macro alias in the commit you flagged. If you map it to LAYOUT_ortho_4x12 for the Contra I'm guessing it will work again, but I have no idea what other boards you have running that code. We didn't have the Breaking Changes policy at that time, or the policy to tag users on GitHub when you edit their code (and I was even worse at C then than I am now).

Sorry for the trouble.