Bring everything up to date

[georgefst]

This builds with GHC 9.2.3 and Cabal 3.6.2.0.

It incorporates all other currently-open PRs (#38, #47).

Initially inspired by this Reddit post, although I've been meaning to pick my own copy of HSoM back up for a while anyway, and I'd much rather make these small fixes than faff about installing an older toolchain.

[georgefst]

Incidentally, the homepage instructions are also out-of-date in a lot of ways:

• "Haskell Platform" is dead - haskell.org now recommends using GHCup for installation, even on Windows
• Cabal v1- commands are likely to cause issues, and will be removed some day
  • For global installs install --lib is mostly fine, although doing everything inside a project is more conventional (but a bit more overhead)
• Atom is basically dead, with VScode being similar but far superior, and now developed by the same parent company
• Whatever editor is used, Haskell Language Server is a priceless addition, and much more advanced than the mentioned ghc-mod-based Atom extension

[Bodigrim]

As a Hackage trustee, I made a revision with version bumps:
https://hackage.haskell.org/package/Euterpea-2.0.7/revisions/

The revision is not sufficient for Cabal (because revisions cannot change build-type), but is sufficient for Stack:

resolver: nightly-2022-06-17
extra-deps:
  - Euterpea-2.0.7@sha256:a885d2f3e82680284a85822d1f1b0e39ae44afbd50e61bf92e38ddbc7694b3b9,2683
  - PortMidi-0.2.0.0@sha256:0671e36ec72e95138bf396234b205864a8a6d0ee353e09e01cbfd57004c56f40,2383

[donya]

I have deleted much of the conversation here. I generally do not moderate conversations on repos I maintain, but I draw the line at people taking digs at my life choices as it has nothing to do with the library. I suggest those who were involved in this PR fork the repo instead.

[georgefst]

I suggest those who were involved in this PR fork the repo instead.

https://github.com/georgefst/Euterpea2