Updated Propify!

Removed the private forward in favor of using Call_StartFunction to call
the handler method directly.
Updated Propify! End Round

Removed unnecessary call to check entity limits.  It was a necessity
when propping players required creating and attaching a prop to them,
but not anymore.
Updated Propify! End Round

Added some checks to re-register the configuration handler when Propify!
is reloaded.