Exact planeclipping for actor's hit algorithm

Exact planeclipping for actor's hit algorithm

rayOriginLocal is difference vector betwwen the actor and the Camera(==rayOrigin).
ActorTest API's distance value is the real euclidean distance between rayOrigin and actor.
But we only need difference vector's z-axis value to clipping by View Space Plane.

So we get hitPointWorld and multiply ViewMatrix (get from renderTask's camera actor)
and get z-coordinate value at Camera Space.

Change-Id: I644fc5e9b306423d6fa58f92e492a2a7508047a6
Signed-off-by: Eunki Hong <eunkiki.hong@samsung.com>