Blender Git Loki

Added an AbcObjectReader class to abstract away object reading and
creation.

Cleanup: pass the archive as a function parameter instead of the
filename.

Remove left over (proprietary) code from DwarfLabs.

Import: add UI params to setup forward and up axises.

Cleanup, try to address alembicManager memory leak.

Remove Python importer.

Remove Alembic properties from ID-blocks, as well as the associated
routines.

Cleanup.

Fix crash during export.

Add support to import cameras.

Set object name properly on import.

Partial port of the Python importer to C++.

For performance reasons, and cleaner code.

TODOs:
- cameras are not imported.
- better handling of the object names.
- object hierarchies/parenting.

Cleanup: function names.

Remove unused function.

Start implementing the importer in C.

Only shell code for the operator is done at the moment. The Alembic API
would probably need to be refactored and cleaned up further before
pursuing this.

Merge the 'Alembic' modifier in the 'Mesh Cache' modifier.

Apply patch in a new branch.