Modified the tileset template a bit to add foreground element tiles and combination solid/platform tiles, since it was getting hard to make natural transitions between solid and platform tiles in some circumstances. The code for these will be kind of tricky, so I may end up trashing these tiles, but they’re in for now.
I also added support for ’empty’ frames in animations, as a necessary step towards adding a new frame button. Which I actually didn’t need to add, because I already made it, and it works now. There’s still some pretty buggy stuff associated with it, but the thing itself works. The biggest problem I’ve run into is that frames of different dimensions actually totally breaks my frame drag and drop code, which is pretty bad.