EC_Placeable: Fix major perf problem with parent detection from EntityCreated signal. At its worst Lookup was iterating the whole scene to find parent by name. In my 1800 entity scene, where everything was parented to a late id entity this made Tundra update once in 45 seconds. Each creted signal iterated the scene for each entity waiting to be parented. Not sure why this EntityReference::Matches func was not created before, it seems obvious we dont need to do a Lookup here from the scene as we have the entity to compare against right there.