Removed some redundant subtypes.
In the old site codebase we had to keep domain/range-includes
statements referencing subtypes, as a software workaround.
This can now be cleaned up.
Updated 'actor' property to accomodate video games, clips. Removed
redundant subtypes.
Added VideoObject, VideoGame as types that expect 'actor'.
We should do 'director' too.
Updated 'director' property.