Stop running mod classes through mixin to improve classloading speed.

[modmuss50]

Id suggest possibly adding an opt-out option to allow mods such as the lang loaders to skip mixin's transformers, should in theory save a bit of speed.

Right now mixin will be transforming every mod class (including the language adapters). Needs testing to make sure its actaully worth it.

[Leo40Git]

If I'm reading this right, the mod that wants to mix into another mod needs to opt-in.
How would we specify that? Do we just stick a

"iWantToMixinIntoTheseMods": ["mod1", "mod2", "mod3"]

in the fabric.mod.json?

[modmuss50]

It would have to be an option to allow any mod to mixin its self (Should it pass through mixin or not). It would still get transformed by loader's internal transformers.

[liach]

@modmuss50 Aren't mixins class-specific? If the classloader is just looking up relevant mixins in a map, I fail to understand why classloading speed is slow.

[modmuss50]

I dont believe this is a major bottleneck in classloading speed. I should have benchmarked this before creating the issue.