GUI: Persist transcription app configv0.2

The configuration of the transcription app, such as the number of rows
and columns in the text box, now persists across app restarts. I found
that I would have to change from the defaults to my preferred config
every time I started up in VR, which was annoying. Now we just start
with the config that was set last time.

* Add dependency on rapidyaml (MIT)
* Serialize transcription config to file under Resources/
* Add Config class to wrap serializing/deserializing
* Update build instructions
* Simplify StartApp() API, taking Config struct instead of a ton of
  arguments

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