Support JSON Schema

[nexushoratio]

It is joked about:

userscripts/linkedin-tool.user.js

Lines 59 to 60 in 8829a0d

	* TODO: Over engineer this into having a schema that could be used for
	* building an edit widget.

userscripts/lib/base.js

Lines 876 to 877 in 8829a0d

	* be modified. This could be used to provide a UI to edit the object,
	* though no schema is provided.

It turns out to really be a thing!
https://json-schema.org/

Also of use might be:
https://schema.org/