local: Generate a custom name for the media renderer pipelines
owr: Add default deep-notify handler again to all new pipelines
owr: Add back API to media renderer, transport agent and media source to dump a pipeline graph
transport: Put all elements related to a remote media source into its own bin

... instead of putting them all into the transport agent bin directly.
This will make the pipeline diagrams a bit easier to understand and will
also make it easier to remove a remote media source again later.