To Do
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* Status web app as PWA
* Move `video/` and `audio/` into new `incomplete/` directory
* Set title for audio CDs on read
* For audio CDs, set completion to null, and have that result in a spinny progress meter

Done
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* Status web app
* Report title in status.json
* Output JSON instead of bourne shell for env
  * New function in common: getenv() { jq -r --arg key="$1" '.[key]' env.json }
  * Then just slurp the thing into the status json
* Indicate what is in the encoding queue (# items, titles)
* Completion percentage scraping
  * Handbrake: `Encoding: task 2 of 2, 20.58%`
  * dvdbackup: `Copying Title, part 2/4: 72% done`