Handle NiCollisionSwitch node #2704
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Allows to load optional meshes from the "Glow in the Dahrk" mod with sun rays effect.
NiCollisionSwitch in Morrowind is just a common NiNode with an ability to toggle node collision on the fly via 0x20 flag.
Since we splitted collisions from scene graph, we can not fully implement this feature, but at least we can to check an initial node state in mesh to ignore nodes in auto-generated collisions. Also we can ignore NiCollisionSwitch'es with disabled collisions in the LineSegmentIntersectors, so user can activate objects behind such nodes.
It should be enough to implement non-selectable effects in meshes via such nodes.
Note: In theory, such nodes should cast shadows (but they do not since I use the
Mask_Effect), but we need to introduce a separate node mask for it.