Dev monad schedule without diff

[turion]

See https://hackage.haskell.org/package/monad-schedule. By using this package, I hope to simplify

• type signatures: the monad doesn't appear in the clock type of SequentialClock and Parallelclock anymore
• schedule implementations: these aren't needed in most cases anymore because most monads will have a MonadSchedule instance
• design choices: no need to choose a schedule
• Rhine concepts: only 3 concepts (clocks, ClSFs, SNs) to memorise

The development in this branch is fundamental to other improvements like https://github.com/turion/rhine/pull/143.

To do

• [ ] Changelog entry
• [x] Update cheatsheet
• [x] "Transition from article" page
• [x] Fix https://github.com/turion/monad-schedule/pull/10 first, release, and depend on that version
• [x] Add unit tests for pure clocks and see whether these need some scheduling monad (e.g. Yield at least)
• [x] Merge https://github.com/turion/rhine/pull/233 first
• [ ] Bump version to 1.0 I guess :)
• [x] Run all executables

[turion]

Successful pipeline run depends on merging https://github.com/commercialhaskell/stackage/pull/6734 and a further nixpkgs update. Or else patching the version in the flake temporarily.

[turion]

It seems that CI is not stable enough for millisecond resolution tests. I will have to decrease accuracy to 10th of a millisecond or so. Or seconds right away?

[turion]

Changelog and version bump are for the release PR. I'll do a 0.8 release before the 1.0 release first though.