Add support for Windows 1.x/2.x Icon file format

[superbonaci]

Is your feature request related to a problem? Please describe.

Try to view, edit or convert .ICO files from Windows 1.x/2.x.

http://fileformats.archiveteam.org/wiki/Windows_1.0_Icon

Sample file: CARDFILE.ICO opened by ICONEDIT.EXE:

The data are the black&white pixels, the grey zones are believed to be transparent.

The icon of the program CARDFILE.EXE (CARDFILE.ICO) can be seen in the taskbar, bottom left, when CARDFILE.EXE is minimized:

and sometimes in the About dialog, specially in Microsoft programs:

According to this website, 1.x and 2.x share same icons:

https://www.howtogeek.com/733912/a-visual-history-of-windows-icons-from-windows-1-to-11/

Current output:

$ convert CARDFILE.ICO CARDFILE.PNG
convert: improper image header `CARDFILE.ICO' @ error/icon.c/ReadICONImage/233.
convert: no images defined `CARDFILE.PNG' @ error/convert.c/ConvertImageCommand/3354.

Describe the solution you'd like

Be able to convert from and to ICO file format (Windows 1.x/2.x). For example from and to PNG.

Describe alternatives you've considered

GIMP doesn't have support for it yet:
https://gitlab.gnome.org/GNOME/gimp/-/issues/9814

Additional context

Samples:

CARDFILE.ICO.zip