* make a bunch of implicit scaling rules explicit and move color shaders before scaling shaders in the handheld directory
* remove extraneous file
* switch vhs from viewport to source scaling
Three general purpose multipass shaders:
- lanczos3-fast: lanczos with 3-taps;
- spline16-fast: looks like lanczos2 with slightly less ringing;
- spline36-fast: looks like lanczos3 with slightly less ringing.
