Merge in tests from Zigbeevalve

[lmas]

Let's finish up the work until next week and review the code.

Purpose of the review:

• Finding obvious errors or problems in the code to be merged in (we only want to merge in stable code that won't cause problems for any one else).
• Fix all errors and get green checkmarks for all the automatic tests and linters.

Warning:

• This PR accidentality affected the comfortstat source, so this issue gets double time to solve any extra merge issues.

Activity log:

• 0.5h making an initial quick review
• 1h trying to undo the removal commit of the comfortstat dir but messed up the whole branch massively, revert revert revet.

[lmas]

@SimonPergel maybe you could continue doing this review, inspecting the code for problems the same way I did it?

[lmas]

Initial commits.

[lmas]

I managed to undo the commit that removed the comfortstat dir, in commit 85cccb0.
A side effect is that now it looks like I co-authored all commits from that one, down to commit 29d8424, and that the tests are failing all the time on the comfortstat tests.
But we can merge this PR now without risk of accidently removing comfortstat.

This created a huge mess with the branch and the history on this PR.
Lesson learned: Don't fuck with pushed commit history.

[lmas]

@SimonPergel @gabaxh still waiting on review comments on pake's code.

[gabaxh]

This review will be quite picky as I did not find anything big that I do not agree with but still want to leave some reviews.

[lmas]

Closing, merging into dev instead.