Add the ImageJ 1.x icon of the old Windows launcher

Since we want to support ImageJ 1.x with the ImageJ launcher, too,
we need that icon so we can change the respective .exe files' icon
to the ImageJ icon.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Add a Beanshell script to generate the ImageJ 1.x .ico file

... for use by the ImageJ launchers on Windows.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Add the generated ImageJ 1.x icon for the Windows launchers

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