[EMF] Entity Model Features

RC-1

• OptiFine CEM appears to be officially solved in EMF and seems to be fully working for almost every single use case :)
• large rework, reimplementation, and internalisation of animation code and model variant checking. preventing all occurrences of animation de-sync and fixing animations for all modded/replaced entities/models and block entities.
• various stability fixes to model variants including texture support.
• block entities fully supported (expect a few missalignments due to possible OptiFine part name differences, report these if you can , e.g. lectern and enchating table books might be swapped)
• physics mod compat can now choose to try render the vanilla model parts or the custom EMF model parts
• should no longer cause part not found crashes or model failures
• reduced the log message length of model loading errors
• fixed emf/ & mobName/mobName directory issues
• animations now support model part name hierarchy as in OptiFine. i.e left_arm:hand:finger1 works to separate part finger1 in the left_arm model group from the right_arm one
• warning structure added to detected model overrides prompting to disable setting if it crashes or to warn users of models modified by other mods
• added OptiFine name format support for all previously missing entities including sniffer and camel and block entities
• added support for render variables in animations e.g. render.shadow_size
• expanded animation model variable support to block entities, seemingly matching OptiFines output for these.
• block entity animations support variables "var.???"
• added various render modes for custom parts, NORMAL, GREEN FLASHING, WIREFRAME, OFF, will not affect vanilla parts.
• so much more i've probably forgotten some.