Updated Propify!

Exposed methods to allow other plugins to read from the prop lists.
That was a slight pain in the butt to implement.
Updated Propify!

It'd be nice to have a forward that lets plugins know that the prop list
is being newly read, right?

Yeah, I forgot to make that last time.  Added Propify_OnPropListCleared
for that purpose.
Updated Propify! End Round

Added support to load spawn positions from the prop list.