Blender Git Loki

Fix stupid handling of 'Object.matrix_local' in RNA.

The getter of this matrix (actually, `BKE_object_matrix_local_get()`) was only correct
in case of pure-object parenting, bone parenting and such did not gave valid results.

Also cleaned up a bit setter code, was using as temp storage ob->obmat itself,
which is supposed to be a world matrix!

Reviewers: campbellbarton

Reviewed By: campbellbarton

Differential Revision: https://developer.blender.org/D958