Added audiosource constants
Added audiosource constants

MicroWorldwide/PlayCanvas,sereepap2029/playcanvas,aidinabedi/playcanvas-engine,sereepap2029/playcanvas,guycalledfrank/engine,H1Gdev/engine,sereepap2029/playcanvas,H1Gdev/engine,guycalledfrank/engine,MicroWorldwide/PlayCanvas,playcanvas/engine,playcanvas/engine,aidinabedi/playcanvas-engine