Ensure model resource is cloned when loaded from asset cache
Ensure model resource is cloned when loaded from asset cache

--HG--
branch : feature/model-v3

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