Added warning to SceneRegistry if multiple scenes have the same name
Added warning to SceneRegistry if multiple scenes have the same name

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