12.10.0
- Honor changes to GtkSettings' gtk-menu-images value (LP: #927236)
- do not display an underscore on menuitimes containing a '&' (LP: #994564)
- set the widget for the accelerator even if there isn't a mnemonic (LP: #982656)
- make the vala bindings use pkg-config names, rather than gir ones
- Some platforms don't have valgrind, so treat those unit tests separately
- make headers match independent of the build directory
- constify some public API calls