Blender Git Loki

Bug fix, own collection.

Shapekey drivers were executed for every call to derivedmesh, which shouldn't happen.
It now only runs on the object_update() function, once for every depsgraph change.

Error was found while testing preview render in viewport. On each render, the
animsys sent a 'changed data' because of the shapekey drivers being called,
causing eternal re-render loops (without showing anything).