Add the nodes from the RT thread.
Handle non-realtime clients, we don't need to signal them
do some sort of latency callbacks
Don't do callbacks for clients without a handler.
Add some callbacks to trigger push and pull in a graph
Remove the scheduler, make some implementations of graph push/pull
functions.
Add some properties to jack clients and nodes
Fix the parent of the clients.
Notify link format changes
The listeners are generally useful in spa, move it there and rename
to hooks. Implement loop hooks with it.
Fix some cleanup issues in stream and remote
Remove signals.
Rename callbacks -> events, use listeners to listen for events.
Callbacks are still used in spa for things you can listen to only
once.
