fix: format

[edayot]

A try to format handeling, in the order what the pipeline does :

• assign format to the latest (this is done in Pack.assign_format method, which is automatic at the class creation)
• enter bootstrap
  • if there is a config that specify any format, it overwrite in the pack
  • if no config is found, it check for the minecraft version
  • runs the require section
  • runs the pipeline
  • process overlay format, since they can be created

[SpecialBuilder32]

It looks like this PR does fix the issues I was having with setting max_format in a plugin, and my builds working that is working now.

There does look to be some code for handling the new max_format and min_format in overlays, but I can't get the values set in beet.json to carry over to the pack.mcmeta after build. I tried scrying into the depths of beet but alas I am still not powerful enough. Do we need an @Property setter in beet\library\base\Pack perhaps to write the values to mcmeta? The primary pack uses PackPin's to access the values and ensure everything is synced with mcmeta, but overlays need some extra support maybe?

In my dive I also noticed alot of the pack merge code is missing max_format handling, but has handling for supported_formats. I'm not quite sure what happens to those fields under the current code and pack merging, but it may be worth taking a peek at, or at least being aware that it might be unsupported behavior.