Support for filtering and auto-filling of lookups with owner-subitem relationship.

 - Filter classes by object type. Includes a base for general value list filtering infrastructure that will be used when filtering by owner.
 - Filter selectable value list items by owner
 - Auto-fill owner when subitem is selected. Auto-filling is done only if the owner is empty.
 - Support for asynchronous fetching of individual value list items.
 - The correct owner is determined using the same algorithm used in M-Files Client's metadata card.
 -  Skeleton implementation for clearing a property value when the owner of that value becomes incompatible.