[FIX] Make sure model resource loader does not load materials that have already been loaded
[FIX] Make sure model resource loader does not load materials that have already been loaded

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