feat(Interactions): block invalid collisions on Interactor
feat(Interactions): block invalid collisions on Interactor

The CollisionTracker on the Interactor prefab now also has the
CollisionValidity rules applied to it to prevent any potential forward
source that is ignoring active collisions being able to trigger the
notification aspect of the CollisionTracker.

gomez-addams/SteamVR_Unity_Toolkit,thestonefox/SteamVR_Unity_Toolkit,thestonefox/VRTK