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relnotes: add release notes for relevant changes I did since the 5.4 release

Description

relnotes: add release notes for relevant changes I did since the 5.4 release

After having written the notes, I realized that the added points contain changes
that were part of the 5.4.2 release. These were never included in any release
notes. I asked on IRC whether they should be added to this file or not, but
didn’t get an answer to this question. If they should not be added here, I can
remove them.

Differential Revision: https://phab.mercurial-scm.org/D8770