Update Macos script to use doctype icons for icns builds Fixes https://gitlab.com/kicad/code/kicad/-/issues/14754
Apple UI guidelines ask for small drop shadows on the icons. We add these using ImageMagick when resizing
Creates a script that will fomat the MacOS icons at 80% of the total size in line with Apple's guidelines. Script requires Inkscape 1.0 and png2icns (available on Linux boxen) Fixes https://gitlab.com/kicad/code/kicad/issues/7977