Re: [me-media-timed-events] Restructure use cases section (#23)

I have finished working on this for now. Aside from restructuring as mentioned above, I have:
- Added _Audio stream with titles and images_ use case, covering both HLS timed metadata and RadioVIS.
- Moved content from _Rendering of Web content embedded in media containers_ to introductory paragraph while retaining the three examples. We could move these into their own subsections if we want to add detail.

@gmandyam, please take a look, thanks!

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Received on Saturday, 8 December 2018 10:53:47 UTC