Live Transcriptions for 3.0

[ffdixon]

In 2.7 we had transcriptions, but they are not available yet in 3.0.

Create a plugin that would capture the live captions and populate a panel that would keep a transcript of the captions. The panel would automatically scroll to the bottom.

If the user scrolls up, put a indicator at the bottom when a new entry occurs.

Notes:

• When a caption disappears in the main area, it would appear in the live transcript panel.
• There should be a button to download the transcript in a WebVTT format