Cleaned up slot container interfaces
Made it easier to delete range of callbacks
Player View Box, Spatial Provider stripped of container system.

Players are now given a ViewBox object which will spawn objects which
enter collision with it, and destory objects which leave collision with
it.
VIEWING_RANGE is now 150 (testing purpouses).
Removed ContainerInterface from SpatialProviderInterface.
Some temporary work arounds exist, one such is passing a view box to
UpdateObject (these view boxes will be directly attached later)
LoadContainedObjects commented out in all locations.
Character creation items are commented out.