Fix/config validation

[PriceHiller]

This PR ensures the config validation properly passes for mappings that use false to disable them. This PR also adds new tests for this and removes and updates invalid tests to be correct.

@CKolkey

Resolves the new problem from #635

[CKolkey]

Thanks for the quick fix ;)

Lemme know when its done

[PriceHiller]

@CKolkey

Revert and let me reopen a new PR, I should have marked this as a draft. There's a minor issue I just discovered causing a full freeze of the Neovim client and somewhat incorrect config validation messages.

If you place an invalid command in currently the config validation commits suicide. I have a fix on my side on a rebase that solves this.

I'll open a separate PR with the small patch to apply.

[CKolkey]

Ah, my bad. I saw the thumbs up as "good to go". But yeah, if you stick to draft/ready convention, thats super easy to follow :)

[PriceHiller]

Ah, my bad. I saw the thumbs up as "good to go". But yeah, if you stick to draft/ready convention, thats super easy to follow :)

That's my fault, I thought it was good until I realized at the last moment that it, in fact, was not.

[CKolkey]

Haha, never been there, no sir, can't relate at all.... 🤣🤣