update fat binary for arm64

added some UV Baking information to the readme

Addes some short explanation and example blend file on how to add UVs to the particle system instances.

version bump

build a "fat" binary for mac os

compile against python 3.9 for blender 2.93+

update python version against which this addon is being compiled

fix english grammar

hrmpf, blender 2.90.1 still uses python 3.7

was assuming the switch to 3.8 was already made.
Trying to adapt this now in the builders.

try to additionally link math lib (lm)

fix uv baking

fixed baked UV rendering

forced the angular velocities to be written into the pointcache as well