The current documentation on `AssetRepresentation.full_library_path` indicates
that it will give the fully qualified path to the asset (the path to the
`.blend` file extended with the path to the asset).
This is not the case however, and it only returns the path to the `.blend`
file, leaving there no way to actually get an easy-to-use path to the asset.
This commit adds a new `full_path` property to `AssetRepresentation` that lets
the user get the fully qualified path to the asset. The documentation for the
`full_library_path` has been updated to accurately reflect what it does.
166f7c7a98