OSC 4/10/11 support

[arjaz]

OSC 11 is not supported, from the looks of it.
printf '\e]11;?\a' produces no output in ghostel, while it produces something like 11;rgb:ffff/ffff/ffff in ghostty.

The same is true for OSC 10 via printf '\e]11;?\a' and OSC 4 via printf '\e]4;INDEX;?\a'

[arjaz]

Practically speaking that means programs like duf might incorrectly assume the color theme.
Ghostty vs ghostel for comparison

duf in ghostty:

vs

duf in ghostel:

duf --theme light in ghostel:

[dakra]

Fixed on main.

Thanks for the report.