Need to fix picking not to use the last synced camera value for pick computation

Currently picking uses the last synced camera rather than the current values of camera in the scene graph.
This is a problem when, for example, a user changes the fieldOfView for a perspective camera and then did an immediate pick.
Fixing this would also allow the "pickingCamera" workaround to be removed.

Changeset: b8de44e3e523
Author: Pavel Safrata
Date: Fri Apr 06 12:59:45 2012 +0200
URL: http://jfxsrc.us.oracle.com/javafx/2.2/scrum/graphics/rt/rev/b8de44e3e523


Description:
Scene code cleanup - multiplicated picking and parent traversing code merged together, got rid of many instanceofs. RT-19346, RT-20832 and RT-20833 fixed along the way.