More updates related to reading position notifications
Allow a client to receive notifications through AtspiEventListeners. This involves special casing, since the event is generated by the screen reader, not the GUI, and is, thus, handled by a different DBus interface, but, from the client's perspective, it looks like a normal AT-SPI event. Also renamed atspi_text_notify_read_position to atspi_text_notify_reading_position and fixed a few warnings.
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