This is using opacity of 0% to hide them - this way the space stays allocated
and showing it doesn't rearrange things. Using visiblity here causes
everything to shift around on reveal.
Some randome color off the google colour picker that's supposed to look more
like a real paper color. This also means we set the general background white
now to give it a better contrast.
This is a plain subtree merge without any changes to the tuhigui tree itself.
As we'll keep the distinction between the DBus server and the GTK UI, the
directory layout will reflect that.