Slight fix for triangle assignment to bodypart on partition import

Several small fixes

Replaced check for shader type with check for model space normals flag, as that is when you don't need normals/tangents (see loadscreenbretonmage.nif for example)

Postfix "dev" to allow distributing plugin before release, should be removed when releasing.

Release/v0.0.12

Pull out nifformat_to_mathutils_matrix, improve comment

Anim system improvements

only works with armature animation at the moment (force import skeleton only)
imports different controller sequences as separate actions
change priority of interpolator vs controller

Release/v0.0.11