This provides a more efficient way of determining the bounds by avoiding LINQ. A helper that works directly on arrays prevents allocation of an enumerator when the collection is know to be an array.
Additionally, internally renamed VisualBounds to SelectionOverlayBounds to avoid confusion with RenderBounds.
This step was necessary to prevent actors with selectable area smaller than their graphics to be removed too early from ScreenMap even though part of the graphics should still be visible.
RA cruisers were a prime example, but to a lesser extent several other actors were affected as well.
This separation also serves as preparation to determine the final RenderBounds from multiple source bounds later, to fix the remaining ScreenMap issues (building 'bibs', aircraft shadows).
Return an empty enumerable immediately rather than allocating a compiler generated enumerable via 'yield'. We can defer allocating these until we actually need to draw them.
Also, cache the trait lookup.
The player can now cycle between;
-Standard: Health and Status bars display only on mouse hover.
-Show On Damage: Health shows on damaged actors, Status always shows.
-Always Show: Health and Status bars are always displayed.
