atk/atkobject.[c|h] Remove the following properties accessible-child - use

atk/atkobject.[c|h] Remove the following properties accessible-child - use

* atk/atkobject.[c|h]
Remove the following properties
accessible-child - use signal children_changed for notification
accessible-text - use signal text_changed for notification
accessible-caret - use signal text_caret_moved for notification
accessible-selection - use new signal selection_changed
for notification
accessible-visible-data - use new signal visible_data_changed
for notification
accessible-model - use new signal model_changed for notification
Notify when role or parent changes
Allow parent and role to be set or got using g_object_set() or
g_object_get()