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.