* Adds icon state configuration to GAS (#58487)
Relatively simple change that allows you to specify icon states in greyscale config so as to allow generating icon files with multiple states. This is a requisite for GAS to work with icon smoothing.
Also a couple bits of additional warnings and documentation.
* Adds icon state configuration to GAS
Co-authored-by: Emmett Gaines <ninjanomnom@gmail.com>