This commit improves the Night Light code in various
ways:
* Turn it into a template class, subclass of GtkDialog,
and adapts all the code to reflect that.
* Update the code style in various places, to make it
more conformant with the documented code style.
* Reorganize the code a bit, moving functions around,
to make it more conformant with the documented order.
Recent versions of Gettext are able to translate several formats
that are used in GNOME applications. This patch migrates from
Intltool to Gettext by using meson's i18n features.
https://bugzilla.gnome.org/show_bug.cgi?id=787588
In order to share the libgd and gvc modules between autotools and
meson, this patch moves their directories to subprojects
directory and updates autotools.
https://bugzilla.gnome.org/show_bug.cgi?id=785414
The current CcKeyboardPanel used to manage keyboard
editing through GtkCellRendererAccel, which was replaced
when we moved to use a GtkListBox. Because of that,
the ability to edit shortcuts is now missing.
Re-add shortcut editing capabilities through a new dialog,
which is done according to the latest mockups available.
https://bugzilla.gnome.org/show_bug.cgi?id=769063
This is needed for three reasons:
* To be able to arrange the icon into a folder in GNOME Software
* So that we do not allow the application to be removed
* To show the update description not in the 'OS Updates' package section
... and add translator comments explainings what they do. The RTL
languages are likely going to want to show them in a different order.
We should eventually move to just using GnomeWallClock and/or
g_date_time_format with %c that already have translated the time format
strings. However, in case this doesn't make it in time for 3.10, mark
the current strings in g-c-c as translatable to get some translation
coverage.
https://bugzilla.gnome.org/show_bug.cgi?id=694985
