security cameras through object collision; new mirror issues

added another (better?) approach to security cameras via simple object
collision
ofc it needs a lot of refining, but w/ this it should be easier to
create the prototype assets
also, it looks like our current mirror setup needs some "wiggle room"
behind the teleporting plane, otherwise the collision w/ the mirror
isn't registered. that means, for the time being, that our prototype map
should have holes where mirrors are supposed to be. just like the test
scene!