UniMixins

GTNHMixins module:

• Made GTNH-relocated MixinExtras unavailable at compile time. It will still be made available at runtime for backwards compatibility (this can be disabled).
• Fix transformers registered after the beginning of the DEFAULT phase not running when late mixins are processed.

Mixingasm module:

• Added a new annotation-based API which does not create a runtime dependency

MixinExtras module:

• Fixed crash with LWJGL3ify
• Source code is now included in the source jar

Compat modules:

• Removed DevCompat module and merged it into Compat module. The old functionality of the DevCompat module can be enabled by setting the -Dunimixins.compat.hackClasspathModDiscovery=true JVM flag.
• Removed 1.8+ compatibility stub from Compat module since it caused mods to fail to compile. Its functionality has been moved to a new module called Future Compat
• Made ASM remapper transformer ~90% more efficient