What's new in at-spi2-core 2.7.3:
* Atspi_accessible_get_index_in_parent no longer returns -1 if the object's
parent is not cached (BGO#688057).
* re-register keystroke listeners if the registry goes away and then returns.
* Fix atspi_device_listener_new_simple.
* Fix some compiler warnings.
* Build: use gobject-introspection's Makefile instead of rolling our own.
* Fix a crash when parsing events without detail when there is a listener for the event that names a specific detail value.
* Fix crash when removing hung processes.
* Fix deregistering of applications.
* A few documentation fixes.