Mhx import: Rigify custom shapes now work even on second import. Rigify rig assigned to group for file linking.

 - Added tracker and wiki URLs
 - Fixed usage of Matrix.Rotation

[[Split portion of a mixed commit.]]

removing ui_utils module, wasn't used anywhere and only wrapped button functions giving minimal benefits.

- remove/comment unused variables
- remove unused imports
- fixed some bugs using incorrect variables

- remove unused imports
- remove/comment unused vars
- fix for some bugs with unused vars being used

removing this module, it wasnt used anywhere and bpy_extras.view3d_utils has view functions like region3d_get_2d_coordinates

fix issue #1 from bug [#27896] B258.0 > X3D export > 3 bugs: "MA_Black".001, lib groups, Rotation 0 0 0 0

replace intersection paint with simplified angle comparison.

remove tricky and not especially good method of finding the point on the path to use to calculate the handles, using the 1/3 and 2/3 works better.

Save as Runtime: We don't need to copy Python for OS X since on OS X the blenderplayer is built with Python already bundled in the .app folder.