Framework: Delete unused files

[vkucera]

See #14973

[github-actions]

REQUEST FOR PRODUCTION RELEASES:
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[ktf]

Features.h should stay. The rest can go. Can you split the PR?

[vkucera]

Features.h should stay. The rest can go. Can you split the PR?

Thanks for checking. How do you want to split it? Or do you just mean removing Features.h from the PR?

[ktf]

Or do you just mean removing Features.h from the PR?

Yes, that's what I mean.

[vkucera]

Or do you just mean removing Features.h from the PR?

Yes, that's what I mean.

Done