Fix mispositioned window menu in hi-dpi

We always want to send the position in device pixels,
so apply the window scale before sending them out.

https://bugzilla.gnome.org/show_bug.cgi?id=738955
Implement support for ATK_STATE_HAS_TOOLTIP

https://bugzilla.gnome.org/show_bug.cgi?id=738982
Fix to gtkstatusicon.c to allow building both X11 and Quartz backends

https://bugzilla.gnome.org/show_bug.cgi?id=739005