Experiment: Try to make crunch64 not mandatory

[AngheloAlf]

WIP for issue #331

The current state is an experiment. Looking for testing and feedback

With this branch you could avoid installing crunch64 and use everything else without much issue.
For this you would need to install [mips-min] instead of [mips] dependency group.

To test this branch, either:

• Checkout with git and do pip install .[mips-min] on a fresh venv.
• Directly with pip pip uninstall splat64 -y && pip install git+https://github.com/AngheloAlf/splat.git@optional-dependencies[mips-min] on a fresh venv.

A fresh venv is needed to ensure you don't have crunch64 from a previous installation.

If splat detects you want to use either mio0 or yay0 then it suggest you to install splat64[compression] to get them, since they aren't available here, I think. I haven't tried this tho, so would be nice if somebody tries it out first. splat64[compression] implies both splat64[compression,mips-min]

The usual splat64[mips] group still installs crunch64 to avoid breaking current setups.

[ethteck]

I like this approach a lot. I think the only thing I'm not in love with is specifically the name mips-compression, because I believe crunch64's compression formats go beyond mips-based platforms. Or at the very least, they aren't related to a specific ISA, even if they are only used in mips-based games. I'd potentially just call the 'feature' compression? but as I say that, I'm not sure. anyway there's my thought process. see ya

[AngheloAlf]

Renamed