Partial zeroing

[ExpHP]

Contains a portion of zero's commits from #63.

This branch has been reconstructed from the common ancestor of main and #63.

• I began from the common ancestor of main and Format improvements (WIP) #63, which is
• The first four commits from zero are squashed (this was to facilitate merge conflict resolution)
• Commits were then cherry-picked from main and format_improvements_test in an order that seemed easiest to resolve.
• When I reached the point where I had included all commits up to where zero attempted to perform a merge, I cherry-picked the merge. All conflict resolutions were resolved in favor of the current code, so it's just an empty commit now that documents this fact.
• Notice: I did not get rid of decompilation of string enums. The way I was constructing the branch, I figured it would produce much fewer conflilcts to leave it this way. If we want to do that we can do it afterwards.
• Then, finally, and this is the big one, I merged main into it so that all of my new latest stuff is there. This branch won't be easy to rebase onto main, but it should at least be easy to merge into main now.

After working with it, I don't think there's anything in here that I am opposed to merging. I would like to fix the test suite though and maybe add some tests for new stuff.