Migrate EditCalendarActivity to Compose

[ArnyminerZ]

No description provided.

[rfc2822]

Thanks! Unfortunately, reviewing a +957 −176 PR is almost impossible for me right now. It takes far too much time to this properly.

Please split the rewrite to Compose into smaller PRs, ideally with these conditions:

• PRs should not add more lines (except comments etc.) than ~ 100 lines in sum (i.e. added lines minus removed lines). Ideally, every PR removes more line than it adds –
• No new features, UI redesigns, animations etc…; only what is absolutely necessary. We can add other things later when the big migration is done.
• Only one PR after the other (at any time not more than 1 open PR regarding Compose).

I hope this could result in a better work flow that is also more satisfying for you.