Auto-extract latest resources from local jar files

[TheDuckCow]

For various reasons, it is becoming increasingly important that MCprep can extract resources (textures, models, etc) from local Minecraft installs, potentially with MCprep itself not packaging a default resource pack on download.

Required changes

• We migrate and generalize the pre-existing script used to update mcdata (currently: mcprep_data_refresh.py) to run on end-user machines
• Create hooks to know when to auto perform this function
• Ideally, we pair this with some options to also detect and configure which resource packs the user already has installed. This would pair nicely with the feature to stack resource packs: Support "Installing" and layering multiple resource packs #123

[StandingPadAnimations]

Adding to this, Blender Studio has also released their own utility for batch processing of files, which should help with adding textures to assets