Library Profile: We need some objects for the LibraryUseEvent.

[moakleaf]

We need identifiers for the LibraryUseEvent, which is about being in the library to do something that may or may not be directly related to a library participation or resource usage. I think those things include a location (main library, branch library, law library...), a sub-location (learning commons, study room, makerspace...), and a time/date stamp.