Remove regen call from ReferencePoint.Point

This is a simple and obvious fix - properties should not have a regen side effect.  

Further, the original regen call was introduced only for the case where a ReferencePoint is constructed on a Face Reference.  I've moved the only regen call to the constructor where such a ReferencePoint is created, so it is invoked only once.  Incidentally, this also removes an undiscovered crash where the regen call was invoked from an InfoBubble.  

@lukechurch, @ikeough