fix attempt for conversion of multiple FM objects to keyframed shard objects

potential fix for incorrect external mode custom rotations after loading

disabled offset based fallback in rotation calculation

it caused unwanted sudden rotation changes

only write rotation data to mesh if particle rotation was enabled

fix for rotation calculation in anim bind

fix attempt for binding to particles

deform mblur fix FM

call for precalcing velocities was not always reached (only for autohide enabled)

grr formatting typo

update links to FM hosting pages

partial fix for wrong rotation when converting to keyframes

forgot to initialize ob->quat for passive objects, they are most likely in euler rotation
mode still and the ob->quat seems not automatically in sync

expose rigidbody apply_force and apply_torque to python via rna function

crash fix for using Final Solid if derivedFinal is NULL

was missing a nullpointer check, fallback is to return a DM of the basemesh

pull animated bind update calls out of loop

the function does a loop on its own (over meshislands in fm)

fix attempt for previous rotation fix with bound objects

fix for bound object lagging behind one frame

hopefully proper rotation fix for animated mesh bind

backport of master fix for https://developer.blender.org/T56969

allows to let the branch run with python 3.7 too

transform fix for external centroid-based constraints

small fix for minimum mass and UI float display precision changes

testing now against being smaller than minimum mass 0.001 and setting it to 0.001 instead
of testing against 0 (useless with float)
adapted displayed UI precision with breaking threshold, cluster breaking threshold, breaking distance and cluster breaking distance.

fixes for dynamic fracture

fixes for:
- speed transfer (shards could stop their motion)
- shards could be stuck in the air
- ghost dynamic triggers work now too (firing a contact callback)