Add Colemak keyboard layout to the installer

[ilyss01]

All linux distros except openSUSE have an option to choose Colemak as default keyboard layout

[shundhammer]

https://en.wikipedia.org/wiki/Colemak

[shundhammer]

It looks like it's already available in the installed system (Leap 15.4 in this case).

% rpm -ql kbd | grep -i colemak
/usr/share/kbd/keymaps/xkb/gb-colemak.map.gz
/usr/share/kbd/keymaps/xkb/no-colemak.map.gz
/usr/share/kbd/keymaps/xkb/ph-colemak.map.gz
/usr/share/kbd/keymaps/xkb/us-colemak.map.gz

[shundhammer]

That of course means you can already use it in the installed system with command line tools or with your desktop environment's keyboard selection.