Add new PaletteMenuItem widget for usage in mixed content Palettes

As Palettes can either include a Gtk.Menu or a Gtk.Window we
have to use a "false" menu when we want to have both
functionality in a Palette. This is a new class PaletteMenuItem
for those use cases.

Code highly based on the work from Gonzalo Odiard. The API is
based on the one from GtkImageMenuItem [1].

[1] http://developer.gnome.org/gtk3/3.4/GtkImageMenuItem.html

Signed-off-by: Simon Schampijer <simon@laptop.org>
Acked-by: Manuel Quiñones <manuq@laptop.org>

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