roles: create new AT-SPI2 roles for ARIA roles (and one for rating)

https://bugzilla.gnome.org/show_bug.cgi?id=712608
Bump AT-SPI version requirement

New roles are present in 2.11.2 and later.
states: add ATSPI_STATE_CHECKABLE and ATSPI_STATE_HAS_POPUP

https://bugzilla.gnome.org/show_bug.cgi?id=712609