dialogs: always use CSD on dialogs

If we aren't using a header bar then put a fake titlebar
box on it so we can round the corners.

One of the advantages of this is so that the styling of the dialog
is completely within one theme framework. This prevents skew between
the theming expectations from the window manager and GTK+.

https://bugzilla.gnome.org/show_bug.cgi?id=725345
treeselection docs: spelling fix

https://bugzilla.gnome.org/show_bug.cgi?id=725205
GtkRange: make autoscrolling work for inverted ranges

This problem was discovered in
https://bugzilla.gnome.org/show_bug.cgi?id=725225
Fix typo in gtk_window_set_default() documentation

The documentation should link to gtk_widget_grab_default() rather than
gtk_widget_grab_focus().

https://bugzilla.gnome.org/show_bug.cgi?id=725559
Some more doc rewording
GtkTreeView documentation fixes

Add documentation for GtkTreeView::move-cursor

Add links to GtkTreeModel::row-inserted and GtkTreeModel::row-deleted
in the documentation for gtk_tree_view_set_reorderable ().

https://bugzilla.gnome.org/show_bug.cgi?id=725560
Allow applications to use gtk-enable-mnemonics in 3.12

gnome-terminal is still using this setting, so we'll let
applications override it for another cycle. It is no longer
backed by a system-wide setting, though, and it will still
go away eventually.

This partically reverts 7e3a494fac62140f466fc43f6cc061215953e9b1
Allow applications to use gtk-menu-bar-accel in 3.12

gnome-terminal is still using this setting, so we'll let
applications override it for another cycle. It is no longer
backed by a system-wide setting, though, and it will still
go away eventually.

This partically reverts b26c74e5dac0b5fd869d2c8cc7a0edb6b01aeebd
Deprecate GdkEventVisibility and ::visibility-notify-event

These don't really work anymore in a composited world.
Lets make it official.
https://bugzilla.gnome.org/show_bug.cgi?id=481073
Fix up signal deprecation
Fix up builder test

Dialogs now report two children. Thats alright, adapt
the test to deal with it.
Update messagedialog a11y test
3.11.8
Bump version
Updated Traditional Chinese translation(Hong Kong and Taiwan)
icontheme: support emblems in symbolic icons

We were failing to apply emblems in the symbolic icons code path.

https://bugzilla.gnome.org/show_bug.cgi?id=725683
popover: Set pointer motion mask on the popover window

This is not necessary for the popover itself, but helps tooltips
code confine the widget lookup within the popover if the pointer
is inside it, otherwise the widget lookup may turn out wrong for
motion events, starting the tooltip widget lookup from the toplevel
window, mistakenly triggering tooltips on the natural window
descendants (ie. the widget below the popover)

https://bugzilla.gnome.org/show_bug.cgi?id=724785
Updated Spanish translation
Updated Spanish translation
Updated Norwegian bokmål translation