Draft: All-in-one unicode-data

[wismill]

• Rename the package unicode-data to unicode-data-core and create the all-in-one package unicode-data.
• Use the new version scheme.

Note: This is currently based on #92 and will need to be rebased after #92 is merged.

Fixes #82, #59.

TODO:

• Wait for Update to Unicode 15.0.0 #92 to be merged
• Remove deprecated features
• Add a prominent warning (in README/package description)
• Inform the existing users of unicode-data

[harendra-kumar]

1. Since unicode-data is now a large package we should provide a prominent warning (in README/package description) that this may be a heavier dependency, taking more time to compile and more disk space. Users may want to consider depending on individual packages esp unicode-data-core for lightweight use.
2. We should proactively inform the existing users of unicode-data (using reverse dependencies, maybe raise issues in their repos) that they should depend on unicode-data-core instead, otherwise this may come as a surprise to them.

[harendra-kumar]

Note: This is currently based on #92 and will need to be rebased after #92 is merged.

You could choose wip/Unicode_15.0.0 as the base branch for this PR.

[wismill]

I agree with your proposals. I think there is no rush, so we can wait that users first update to 0.4 (#92). Then it would be a good time to remove deprecated features as well.

[wismill]

We can communicate the change. As common sense, users should use upper bounds for all dependencies and consult changelogs. As this will be a big version increase, I think there should be no surprise if bounds are set.

[wismill]

Rebased & add warning.