Validate version files with the KSP-AVC schema

[janbrohl]

Motivation

Version files are hand-maintained JSON, so they are prone to syntax errors and other problems.

A while ago DasSkelett created a GitHub workflow that helps solve this problem on the modder's side:

• https://github.com/DasSkelett/AVC-VersionFileValidator

But maybe it would be worth having some validation in NetKAN as well.

Suggestions

The version file schema now lives here:

• https://github.com/linuxgurugamer/KSPAddonVersionChecker/raw/master/KSP-AVC.schema.json

We could use it to emit NetKAN warnings when there are issues with version files.

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Original issue description

I made a JSON-Schema for .version files. It might be useful for NetKAN in the future. Eg for validation. See gist and forum

[HebaruSan]

Possibly worth considering for #3045.