Sync hierarchy optimization (#1587)
Sync hierarchy optimization (#1587)

* Frozen property added to optimize syncHierarchy

* A fix for _frozen flag issue reported on GH

* Fix sync issue after disable/enable node.

sereepap2029/playcanvas,aidinabedi/playcanvas-engine,MicroWorldwide/PlayCanvas,aidinabedi/playcanvas-engine,MicroWorldwide/PlayCanvas,playcanvas/engine,playcanvas/engine,sereepap2029/playcanvas,sereepap2029/playcanvas