Yeah, mm, turns out I don't think it's actually viable to model from Impress 2020, because we can't reasonably set up the SWFs and PNGs in the ways we need, especially for compatibility with Classic DTI.
We can turn this on again later, once Classic DTI is gone, and all assets are converted to HTML5 -- or if we build some kind of bridge to Classic's asset code, or we write new PNG conversion code.
this is the last one to get parity with current modeling, I think?? I'm gonna add one more feature though: removing no-longer-used assets from the item
