If a prim changes size or shape, add actor to _parent_scene.actor_name_map with new prim_geom key, as the old one becomes invalid.
If a prim changes size or shape, add actor to _parent_scene.actor_name_map with new prim_geom key, as the old one becomes invalid.

This resolves http://opensimulator.org/mantis/view.php?id=5603 where changing size or shape would stop collision_start being fired in a running script.
In both this and existing code we are not removing old actors from actor_name_map when the existing prim_geom is removed, which leads to a small memory leak over time.
This needs to be fixed.

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