Use absolute URLs in @require statements

[zas]

• relative links do not always work (we had multiple reports about this)

See #542 and #579

[kellnerd]

Hmm, using absolute URLs breaks installations from branches other than master and for forks, so I am generally not a fan of that.
I think such issues are bugs of the userscript extensions which should be fixed there, on the other hand we got multiple such reports for different userscript extensions already (#524 has been fixed in VM), so it may be worth it 🤷

P.S. Sorry for the merge conflict, I can fix that once/if we decide to merge this PR.

[zas]

Hmm, using absolute URLs breaks installations from branches other than master and for forks, so I am generally not a fan of that.

Yes, I agree with that too.
But we had issues in the past and they continue, and scripts break everytime :(

Not really happy with this PR either :( but not sure what to do.