Brush and pose asset operators were doing some avoidable roundtrips
through asset types, lookups and rather low level operations. This
indicates that the asset system APIs need some improvements. Moving
lower-level logic there can help avoiding errors, since implementation
details are kept inside the corresponding module.
- Avoid lookups for asset library reference in operator code, make asset
library itself construct it.
- Avoid redundant lookups for asset library definition (was looking up
the asset library definition in the Preferences from the library
reference type, just to turn it into the reference type again).
- Add utility for refreshing loading asset libraries
- Add utility for saving asset catalogs for an asset
- Remove unused function
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