Support for legacyfabric

[BluCobalt]

@Legacy-Fabric ports the fabric toolchain to versions pre 1.14. This pr just adds legacyfabric's meta, using it for versions 1.3.2-1.13.2.

[mindstorm38]

Thank you so much! I didn't know that it existed until now. I have some changes that in my opinion would better fit the stability philosophy of the launcher...

First, I think that this API shouldn't silently hide the normal fabric one (just like we've done with NeoForge), in my opinion we should've a specific function like _with_legacyfabric. Notice the leading underscore, because I would also prefer if these API symbols are unstable -for some time-, to avoid breaking API later if we change the design around legacy fabric support!

This implies that you should also make changes to the CLI (which is allowed to use unstable API because it's internal). Basically adding a search case (https://github.com/mindstorm38/portablemc/blob/main/portablemc/cli/__init__.py#L276) and a start handler (https://github.com/mindstorm38/portablemc/blob/main/portablemc/cli/__init__.py#L448). But also a command line argument to change the version prefix (https://github.com/mindstorm38/portablemc/blob/main/portablemc/cli/parse.py#L51, https://github.com/mindstorm38/portablemc/blob/main/portablemc/cli/parse.py#L147), add it for autocompletion (https://github.com/mindstorm38/portablemc/blob/main/portablemc/cli/parse.py#L162) and add it to search kinds (https://github.com/mindstorm38/portablemc/blob/main/portablemc/cli/parse.py#L216). And finally just add a lang much like for Fabric and Quilt (https://github.com/mindstorm38/portablemc/blob/main/portablemc/cli/lang.py).

Sorry if it feels like a lot more complicated, but I think that it should be quite fast to actually implement, and it allows us to avoid hardcoding supported versions much like you've done wiht LEGACYFABRIC_VERSIONS, which would be complicated to maintain.

Thank you again!

[mindstorm38]

Also, could you retarget your pull request to the v4.3 branch? It is at the same commit as main, so this should be a no-op on your side.

[mindstorm38]

Any update on your side? If you need help, do not hesitate, I can just merge this one on the v4.3 branch and do the work myself.

[mindstorm38]

If you don't answer by tomorrow I'll merge your work and do the modifications myself.

[BluCobalt]

Sorry, I got completely caught up in school and forgot about this. I'd be happy to work on it today.

[mindstorm38]

No hurry tho, I thought you really forgot this pr, and I was going to modify it, keeping your work of course.

[BluCobalt]

Should I add lang for everything loader specific, or just for legacyfabric_prefix for the help text in parse.py?

[BluCobalt]

See #205