What's new in at-spi2-core 2.6.3:

* Fix a crash when receiving a malformed event.

* Fix atspi_accessible_get_index_in_parent when the parent is not cached
    
* Fix crash in atspi_device_listener_new_simple.

* registry: Fix a crash when removing hung processes.

* registry: Fix deregistering of applications.

* registry: Fix crash handling DeregisterKeystrokeListener

* Fix some compiler warnings.