x11/nwg-look: add new port
Nwg-look is a GTK3 settings editor, designed to work properly in
wlroots-based Wayland environment. The look and feel is strongly
influenced by LXAppearance, but nwg-look is intended to free the user
from a few inconveniences:
- It works natively on Wayland. You no longer need Xwayland, nor strange env variables for it to run.
- It applies gsettings directly, with no need to use workarounds. You don't need to set gsettings in the sway config file. You don't need the "import-gsettings" script.