Simple sprites batching, draw-order optimisation (#1623)
Simple sprites batching, draw-order optimisation (#1623)

* Simple sprites batching + draworder optimisation

* != -> !==

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