If we call the listing and applying function directly we either select a
random colorscheme on *no* selection or we have to make use of either
xargs GNU functionality or something like moreutils ifne to only select
color schemes on selection.
Can additionally set a random theme (if selection is 'random') or a
random light theme (if selection is 'light').
Since the existing wayland module basically describes everything about
my 'desktop environment' setup already anyway, might as well rename it
accordingly. Additionally, mako is important for notifications in this
environment so it moves here as well.