This should take care of most of the class property conversions to
use the new annotation format (colon instead of equals) for
assignment. There may still be a few edge cases that were missed.
Bumped verison to 0.1.1
Pep8 cleanup
Replace deprecated imp calls with importlib
Small UI changes
Make the Panel by default closed
Move scene properties to a PropertyGroup
they can be accessed with context.scene.crackit
Fixed some polling issues related to using Fracture
(as the operator will ignore objects that are not processed)
causing the operation to fail further on
Added an option for using the original names or the Enum ones
for the materials shipped in the Blend file
More robust error handling
Add a button for the wm.addon_userpref_show to open the
Cell Fracture add-on if it is not enabled
