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Extend v2 interface to support selection updates

Closes #5

See merge request !8

Add NautilusPreviewer2 DBus interface

See merge request !7

This is needed to help Nautilus update the preview file when we're
open and its selection change.

#5

When the arrow keys are used in the preview window, emit a signal over
D-Bus which can be caught by Nautilus to update our preview file.

#5

This is necessary in order to set our window as transient on the
Nautilus one on Wayland.

We keep support for the v1 interface around as well, in case people may
run a new Sushi with an old Nautilus.

#1

Instead of reading and using the gedit scheme. This is necessary
since we use the dark theme, and gedit may not, leading to unreadable
text.

In the future we may tweak this to have two styles (one for light
and one for dark variants), or something else, but in the meantime
this provides a big improvement in legibility.

#24

This was a fallout from a previous refactor that broke button
actions.

data: localize the appdata file

See merge request !11