Validate our JSON data using json_schema

[skullydazed]

Description

This builds on #10817, and should be merged after that one.

Types of Changes

• Core
• New feature
• Enhancement/optimization
• Keyboard (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).

[daskygit]

After testing this because of the bootmagic lite issue I noticed running make clean would then cause the keyboard build to fail (crkbd:default). It doesn't seem to be limited to that keymap either, quite a few are failing when running make all:default.

I honestly don't know if this is an issue with how I tested the pull request (git fetch upstream pull/11101/head:test/11101) then switching to that branch. I also tried merging develop into this with the same result.

I thought I'd be cautious and mention it here.

[skullydazed]

@daskygit thanks for the report! I've fixed that in 0d391cd90.

[skullydazed]

Travis failures are not related to this PR, and exist currently in develop.