ImageJ Launcher (MacOSX): search for Fiji.icns, but fall back to ImageJ.icns
ImageJ Launcher (MacOSX): search for Fiji.icns, but fall back to ImageJ.icns

For bugwarts-compatibility, we prefer the Fiji icons ;-)

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>

This used to be revision r5227.

imagej/imagej-launcher,imagej/imagej-launcher,imagej/imagej-launcher