[draft] Rework of repository layout

[spirali]

If is continuation of #12. Very incomplete so far, I am now experimenting with different basic types. I am creating this PR for others to see what progress was made.

[spirali]

@DJMcNab The current version is ready for review.

• It fails for wasm target (because kompari-html for review depends on tokio that is not compilable for wasm target, previously I disabled feature "review" in CI for wasm, I am now not sure how to do it properly for whole crate)
• I have disabled Clippy flags for checking metadata because it warns about missing package metadata like description, etc, but they are there (false warnings?)
• I have disabled Clippy flags for missing documentation. I will write docs when we agree on this project structure.

[DJMcNab]

A few nits, all of which I'm happy to defer, but most of which it would probably be easier to do in this PR anyway.

Thank you so much for taking this on - this should make Kompari much more approachable.

[DJMcNab]

The other thing which might be worth changing is making the example test use the "base" Kompari for some/most of its logic.

Deferring that would be fine

[spirali]

Created #15 to not forget about it.

[DJMcNab]

The right solution for WASM I think is to make it so that the only package tested for wasm is the Kompari one. See for example https://github.com/linebender/xilem/blob/8342d8f3d5d1c3f3492c20d245c5704992bc9f8e/.github/workflows/ci.yml#L13

[spirali]

The last issue in CI is now:

lock file version `4` was found, but this version of Cargo does not understand this lock file, perhaps Cargo needs to be updated?

Do you know how to solve it in CI?

[DJMcNab]

Hmm. That error looks like rust-lang/cargo#14655

According to that PR, rust-lang/cargo#12861 should have made this impossible.
The first thing I'd try is deleting and recreating Cargo.lock, and seeing if that fixes it. I expect it to.

The next option would be to manually change the version in the lockfile.
The thing to do is just bump our MSRV to 1.78 (all of the crates we expect to use Kompari use Color already, so it's not a huge loss, and 1.83 was released)