Blender Git Loki

Updates from Roger Wickes

[#16494] Animation Bake Constraints update
links cloned children to cloned parents, useful for ik target baking. whitespace, capitalization.

[#15032] C3D Import script cleanup/IK
Changed code to put IK constraints on a user-defined layer, separate from Markers. cleaned up module naming convention.
removed questionable sloc. add revision history. forced the TrackTo constraint to use a valid marker, and not make up
one on its own.