Make SceneGraph.ForEachSOG() execute once for each SOG, not once for each prim (e.g. a SOG with 3 prims would have the action executed three times).

To do this, a new SceneObjectGroupsByFullID index in SceneGraph which just index's prims by their root part UUID, in order to avoid the inefficiency of filtering existing lists.
Existing callers to SceneGraph.ForEachSOG() did not fail due to the multiple per SOG action executions - they were probably just much less efficient.
Code suggests that no callers expected ForEachSOG() to execute actions on sog multiple times

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