Added more events to pc.Application - ''preload:start", "preload:end", "start"
Added more events to pc.Application - ''preload:start", "preload:end", "start"

sereepap2029/playcanvas,sanyaade-teachings/engine,H1Gdev/engine,shinate/engine,3DGEOM/engine,RainsSoft/engine,maxwellalive/engine,nizihabi/engine,aidinabedi/playcanvas-engine,guycalledfrank/engine,sanyaade-teachings/engine,SuperStarPL/engine,sanyaade-teachings/engine,SuperStarPL/engine,MicroWorldwide/PlayCanvas,aidinabedi/playcanvas-engine,horryq/engine-1,shinate/engine,SuperStarPL/engine,horryq/engine-1,3DGEOM/engine,horryq/engine-1,playcanvas/engine,MicroWorldwide/PlayCanvas,3DGEOM/engine,H1Gdev/engine,maxwellalive/engine,shinate/engine,RainsSoft/engine,sereepap2029/playcanvas,nizihabi/engine,guycalledfrank/engine,sereepap2029/playcanvas,nizihabi/engine,playcanvas/engine,RainsSoft/engine,maxwellalive/engine