Sync with the private repository

Sync with the private repository

Add more log for debugging

Add log for debugging

Update accessibility event code.
Add new API for sending accessibility event to provider.
Clear all registered event callbacks if an instance is destroyed by fault.
To give time to release their resources for event callbacks.
Access status event type is added.
Access status would be sent from the provider.
Update VERSION

Active/Passive update mode is added

livebox_set_update_mode is added.
This only can be used after creating a livebox.
After it gets the created event, the viewer can set the update mode.
Before set the update mode, it will run for passive mode viewer.
So it will send updated event to the viewer for every frames.

Change-Id: I52bc0a38a1a020e7f2b7f60b393234fd325ba127