Blender Git Loki

Alembic: removed a lot of unnecessary & duplicate code from abc_util.cc

create_transform_matrix(float[4][4]) did mostly the same as
create_transform_matrix(Object *, float[4][4]), but more elegant.
However, the former has some inconsistencies with the latter (which
are now merged and made explicit, turned out one was for z-up?y-up
while the other was for y-up?z-up), and was renamed to
copy_m44_axis_swap(...) to convey its purpose more clearly.

Furthermore, "loc" has been renamed to "trans", as matrices don't
store locations but translations; and more variables now have a src_
or dst_ prefix to denote whether they contain a matrix/vector in the
source or destination axis orientation.