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1. Add launchable desktop-id tag to fix generation with `appstream-builder`
2. Refresh to pass: `appstreamcli validate --pedantic xfce4-power-manager.appdata.xml.in`

We should:
* always have the same inhibit state for DPMS and screensaver;
* activate inhibition whenever an inhibit request is received *or*
  presentation mode is enabled;
* lift inhibition only when presentation mode is disabled *and* no
  inhibition request is active.

This change achieves this, simplifying and clarifying the code in the
process.

Fixes: #210
Supersedes: !55
Co-authored-by: Paul Ezvan <paul@ezvan.fr>

Libxfce4ui >= 4.19.4 can be built without X11 support and therefore
whithout XfceSMClient.

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Initialization could in fact already fail on X11, although it probably
shouldn't happen often and probably doesn't cause a crash. On Wayland it
may be that the protocol is not supported, in which case it would cause
a crash and there's then no reason to keep this object alive.

No Wayland counterpart yet. The wlr-gamma-control protocol offers an
apparently similar feature, but is in fact unrelated to power saving.
However, the Polkit implementation works just as well on Wayland as on
X11.

Many of the disabled paths are temporarily disabled, before a Wayland
implementation is added in future commits. They are therefore only
deactivated at compile time, so that you can have a test version on
Wayland by building with --disable-x11.

Everything to do with keyboard handling (brightness keys, suspend key,
etc.) is not restored on Wayland, since only the compositor is currently
able to manage this.

It's not necessary to have time to show the window, and it keeps the
application alive if you quit beforehand, for example by refusing to
start the service when it hasn't already been started.

In most cases, it may not make much difference, especially for the
manager who is released last and at the very end of the program. But it
may fix some crashes reported in the past, and in any case these signal
handlers should be disconnected when the object emitting the signal or
the one passed as data is released.

Complete previous commits about debug output.

It is now set in XfpmBrightness, so xfpm_brightness_decrease() and
xfpm_brightness_increase() can work internally as they should. This
significantly simplifies the plugin code.

This also makes the behavior of brightness keys a little more
consistent: if a custom minimum is set (this requires the systray icon
or plugin to be used), it also affects brightness keys, otherwise the
hardware minimum is used (#174).

Finally, the default custom minimum is set a little more intelligently,
depending on hardware delta and setting step.

Fixes: #174
Related: !21, !35

* Make xfpm_brightness_new() a failable constructor, so don't expose
  xfpm_brightness_setup() and remove xfpm_brightness_has_hw().
* Same for XfpmBacklight.
* Remove dead code.

Completes: 47fdeb9c

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