Convert resource loader progress to 0-1 instead of 0-100
Convert resource loader progress to 0-1 instead of 0-100

--HG--
branch : feature/asset-manifest

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