gnome-screenshot-import: add options to set file template, disable flash
gnome-screenshot-import: add options to set file template, disable flash

This renames the "fullscreen" shortopt to -F, but that's fine because
it's the default anyway, and `gnome-screenshot` does not even have an
option for it.

grawity/hacks,grawity/hacks,grawity/hacks,grawity/hacks,grawity/hacks,grawity/hacks,grawity/hacks