Problem: Cannot detect whether modifyOtherKeys is enabled.
Solution: Use XTQMODKEYS introduced by xterm version 377 to request the
modifyOtherKeys level. Update the keycode check results.
Problem: libvterm with modifyOtherKeys level 2 does not match xterm.
Solution: Adjust key code escape sequences to be the same as what xterm
sends in modifyOtherKeys level 2 mode. Check the value of
no_reduce_keys before using it.
Problem: Keycode check script has a few flaws.
Solution: Sort on terminal name. Ignore XTGETTCAP responses. Check for
version and status response. Update entries.
Problem: Cannot easily try out what codes various keys produce.
Solution: Add a script to gather key code information, with an initial list
of codes to compare with.
