* 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
* fix preset parsing issues from https://github.com/libretro/slang-shaders/issues/369
* one more preset fixed
* fix some malformed preset directives
* fix preset lines erroneously ending in semicolons
* fix another malformed preset directive
* make sure grade and glass at least load properly
* comment one more bad path