skip wiggle pre when rendering

hopefully avoids crashing

multiple view layer fix

technically its just skipping evaluation when the frame hasn't changed

edge case handling of stuck rendering flag

assume a user will try to toggle some setting to get things working again

Merge branch 'main' of https://github.com/shteeve3d/blender-wiggle-2

Merge pull request #2 from shteeve3d/wiggle-bake

2.1 changes

added wiki url to addon