What's new in at-spi2-core 2.45.90:

* xml: Add some documentation.

* xml: Fix event arguments.

* xml: Add some missing DeviceEventController methods.

* Bind the AT-SPI bus to the graphical session.

* Mark bus service as belonging to the session slice.

* Add ATSPI_ROLE_PUSH_BUTTON_MENU.

* Add an "announcement" event/signal to allow objects to send
  notifications (!63).

* Various code clean-ups and test improvements.