* help/C/shortcuts.page: Document new shortcuts.
* src/client/application/geary-controller.vala: Add shortcuts for copy
and move actions.
* src/client/components/pill-toolbar.vala (PillBar::create_menu_button):
Hook up the button's related action to invoke the button's popup menu,
taking care not to cause an infinte loop.
(PillBar::setup_button): Connect to the related_action's tooltip notify
signal via a local variable rather than via the button, so it does not
get lost when it changes for Gtk.MenuButton actions.
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