The localization headers are now included via "nm-default.h".
Also fixes several places, where we wrongly included <glib/gi18n-lib.h>
instead of <glib/gi18n.h>. For example under "clients/" directory.
If an NmtEditorGrid row has a widget, but no label, then we make the
widget span both the label and widget columns. But previously we
weren't doing the same for rows with labels but no widgets. (In fact,
we didn't even allow rows with no widgets; label-only rows had to
specify dummy widgets.)
Fix it so that labels will span into an empty widget column. (This
ensures that a long section name won't force the entire grid to have
an overwide label column).
Also, in both the "no label" and "no widget" cases, still show the
"extra" column if it's present.
Instead of having NmtEditorPage be a widget itself, have it just be an
object that returns a list of NmtEditorSections, where
NmtEditorSection is a subclass of NmtNewtSection.
(This will be important when adding VPN pages, which will be split up
into multiple sections, but with the different sections needing to
cooperate on updating the NMSettingVpn. This reorganization lets us
have an NMPageVpn containing multiple sections, with the NMPageVpn
object handling the coordination between the sections.)
