interface: add automatic-mnemonics key for Gtk xsetting

Needed for mate-settings-daemon commit f307b35694753bda6edcd299bf8c28d32b25836d
Bump version for materr* changes
Revert "Drop support for Glib < 2.36"

This reverts commit 6a0c8a93e30243232d63487c09ccb15a93755265.
Drop support for Glib < 2.32
Revert "Drop support for Glib < 2.32"

This reverts commit 82d352cb10ed140b618b2c00a3935a3e8c6d1ba0.
Revert "Revert "Drop support for Glib < 2.36""

This reverts commit a0a0a16fb72bb7b592d23ce29ca52c7d63c2e40b.
Fix/Update NEWS
removed some unused code
Fix some AC_ARG_ENABLE if_found issues
pnp.ids: Pull latest from gnome-desktop
Merge remote-tracking branch 'upstream/master'