======
* Added a Matcher class which can select folders by their metadata.
* `rehearse` function uses the matcher to branch to different folders.
* `turberfield-dialogue` utility uses the matcher likewise.
* **Interludes from now on must return a metadata dictionary**. Fixed the
documentation and demo scenarios accordingly.
* Fixed a bug affecting the TerminalHandler when *simpleaudio* is not available.
* Simplified the documentation relating to VSCode.