Add error message if using new scripts in old project.
Add error message if using new scripts in old project.

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