Support for LegacyFabric

[BluCobalt]

Continuation of #197 but targetting v4.3 instead of main

[mindstorm38]

Thank you! It's really looking good. Could you fix (remove) modifications by your automatic formatter? This added many space in some places.

[mindstorm38]

Oops I'm on mobile and misclicked resolving, yes you're right about the message. You can just add precision for legacy fabric in parentheses.

[codecov]

Codecov Report

Attention: Patch coverage is 33.33333% with 14 lines in your changes are missing coverage. Please review.

Project coverage is 63.73%. Comparing base (10b4b14) to head (e05430b).

Files	Patch %	Lines
portablemc/cli/__init__.py	0.00%	13 Missing ⚠️
portablemc/fabric.py	80.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             v4.3     #205      +/-   ##
==========================================
- Coverage   63.89%   63.73%   -0.17%     
==========================================
  Files          20       20              
  Lines        3271     3284      +13     
==========================================
+ Hits         2090     2093       +3     
- Misses       1181     1191      +10     

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[mindstorm38]

(don't care of codecov)