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Adds configuration file for enabling CI. Addresses #10

Introduce a GbbPciDevice abstraction and use it to discover gpus
in the system.

Fix a integration test where a sysfs value starts does not work
with base autodetection.

Gtk+3 reports physical pixels on Wayland but application pixel on
X11. See https://bugzilla.gnome.org/show_bug.cgi?id=783995

In case want to compare GNOME vs other DEs.

Introduce two new helper functions to make cleaning strings we
get back from helpers and such easier.

Use g_strstrip instead of just looking for trailing newlines.

The JSON we get from 'gbb info --json' is now omitting fields that
were previously reported as 'Unknown'.

Don't depend on glib 2.50 functionality. Also avoid unnecessary
c99-isms.

The gdk_monitor_xxx API is 3.22 only, so guard these.

All fields (or groups) that we could not get the information for
will be just omitted from the json, because that is intended to be
read by machines and that the absence of the field better
communicates the absence of information.

Explicitly make note if we could obtain that information so we can
act on that later.

With the previous patch a call to g_object_get of these properties
will still return 'Unknown'.

The helper will also handle the case when the value is NULL,
preparing for a future changes when info fields can be unset if
the information for them could not be obtained.

Report unknown if a string property is NULL. This makes it possible
to avoid setting all fields to 'Unknown' in the various functions
that fill in the system information.

This will enable us to distinguish between X11 and Wayland, which
might reveal important differences in power consumption in those
too.

Use bulk property installation via g_object_class_install_properties.

Uses gdk to get monitor information, tries to identify the builtin
monitor via the model string; if that fails uses the primary one,
and finally falls back to the first if none of that works.

In the case there we have less then 3 components for the kernel
we return the un-split string, but we need to make a copy of it
before.