* object registration adjustments for players and avatars and lockers (especially lockers)
* refactored locker container
* modifications to fields and method names for guid-related files; SpecificNumberSource created
* locker item display; proper item insertion into locker-space and searchability of that locker-space
* proper item removal from locker-space, including swap-items on other insertion tasks
* comments and tests; adjusted avatar/player registrations; allowed for restriction in the SpecificNumberSource; renamed CataloguedInventory to LocallyRegisteredInventory, and made internal object registration work
* accommodations for RequestDestroy, to allow the locker's Clear button to work; modification of expectation for resolving projectiles through ValidObject
