action to check patches

[AiyionPrime]

This currently implements only the gluon part.

The outer parts of the site patches are not checked, but have been brought in the same format as the inner patches.

Whats left todo:

• [x] implement a refresh-site-patches.sh, which does what I've done to the outer patches
• [x] implement an action which verifies calling efresh-site-patches.sh does not change anything, hence the patches are indeed in a clean state
• [x] add documentation how to properly format site patches
  • [x] document how to use make refresh-patches in gluon (should have been done already and makes upstreaming patches easier)
  • [x] document how to use refresh-site-patches.sh in this repo afterwords (should be done to make maintaining patches easier and clearer)
• [x] optionally have something to trigger this upon commits in gluon, or worse: cron-based

Merging this will eventually resolve #83 and make submitting patches a little harder, but cleaner, so that reviewing patch PRs to this repo will become easier. Furthermore it won't matter anymore, which OS we used to format the patch.

[AiyionPrime]

Cron trigger is in place for both actions. The clean alternative would require gluon to start our workflow upon changes.

[AiyionPrime]

Refreshed the patches, squashed intermediate commits and completed the list from above. If someone could review this, that would be nice.