PlaylistObserver: support single handler for multiple types #334
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…tion to terminate iteration
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The PlaylistObserver pattern currently requires that a handler be installed for each event type of interest.
This PR extends PlaylistObserver to support use of a single handler for multiple types.
In this way, if the handlers are the same for multiple event types, they can be collapsed into a single handler.
In addition, this PR adds the ability for a handler to terminate iteration.