*UPDATE: After days of work and probably around 20hrs of total work, I finally figured out it was Spriter's fault the entire time. It took me so long because I didn't suspect it as the cause. When I delete all SCML objects, it works, both in simulate and build. No runtime error, no black screen. Spriter just recently released version 10, an update I accepted, after which I also immediately looked for and installed the latest Spriter plugin for C2 as well, something I always do after every Spriter update, since it doesn't appear to be done automatically. So there's needless to say a high chance that there's a major bug either in Spriter version 10 or its C2 plugin. I'll look into it further tomorrow and then alert Spriter to it. ...Finally!
I get that error in Intel XDK's Simulation and my game doesn't run, just a black screen.
Uncaught ReferenceError: cr_createRuntime is not defined index.html