Removing PropertyMapper and subsequent cleanup work.
This job is now done by EntityAccessFactory and EntityAccess, with PersistentField holding information about the fields.
Moving classes to more appropriate places.
Moving Person test class to be in line with its Bike counterparts.
Moving FieldEntityAccess so that it's with its EntityAccess counterparts.
Investigative work on implementing field-based EntityAccess.
Very much work-in-progress, probably worth leaving until t'setter-based one's matured.