Image generation starts soon

Didn't have as much time as I wanted lately so progress could have been a lot better, but the texture generator is almost fully functional. Operators can be added from the dynamic filter pool, can be connected and disconnected at will and their parameters can be adjusted. What remains are some minor ui tweaks (for example to see the preview of a different operator you're currently editing), the filter editor, and save/load. Oh and of course the ever growing basic filter pool, which will hopefully be the easy part.

I want a working texgen by friday.