dev-utils.mk is meant to provide targets like install-to-system,
which will be invoked during development
Signed-off-by: Jan Lindemann <jan@janware.com>
Trade the bigger images generated by default by a greater variety of PNG icons,
in the sizes 16 32 48 64 72 96 128 144 168 192. I took these from an example
manifest, but I'm not sure about what typical sizes are. The following images
aren't generated anylonger by default: 50 100 200 300 400 500 600 700 800 546.
Also introduce new variable GENERATED_EXTRA_WIDTHS.
Signed-off-by: Jan Lindemann <jan@janware.com>
