What's new in at-spi2-core 2.45.1:

* Atk and at-spi2-atk are now merged into this project.

* Now requires meson 0.56.2 and glib 2.67.4.

* at-spi2-atk: Expose the accessible hierarchy via dbus introspection.

* Properly escape the AT-SPI bus address; fixes warnings about the address
  not containing a colon (!55).

* Add a text value to AtspiValue, so that a value can expose a textual
  description, as in the new Atk value API.

* Add atspi_event_listener_register_with_app, to allow an event listener
  to be registered only for a given application (!52).