Instead of only on bridge startup

When will I stop forgetting this?...

Most useful for leaving abandoned notice rooms

Only the smartphone version shows the verification code required for the
first login attempt...

* Add ability to sync all LINE contacts, which is relevant because the
  list of recent chats excludes users you haven't spoken to lately.
* Add bot command to list all contacts.
* Allow inviting a puppet to a DM to create a portal for that LINE user,
  instead of having to wait for that user to message you first.

Changes include:
* Remove target unit
* Create and use config directory
* Use directory directly under /opt as home
* Rename suggested user/group
* Restart on failure
* (aside) Rename Node module name after Chrome unit

* Update Dockerfiles to work properly
* Use latest available version of Alpine Linux
* Update Puppeteer to 9.1.1 to match Chrome version available in latest
  Alpine Linux
* Add docker script for Node process to allow custom config
* Provide separate example config for running Node in docker

TODO: Update SETUP.md with Docker instructions

Also try to improve accuracy of message dates, and matching user names
to their proper ID & avatar

They belong to the asyncio package, not asyncio.exceptions.
Also remove an unused Tuple import

Needed to kick own puppet when double-puppeting is re-enabled

Just use Dict instead of TypedDict

Also update SETUP/README with instructions

1. Don't set the "own message" promise to null on resolve, as other
   places may still be awaiting on it afterwards
2. Retry pressing "Enter" to send a message if it doesn't work on the
   first try, which can happen for some reason

Even if Chrome is the only window in an X session, and even if the
window is focused, the LINE extension stops getting new messages unless
the mouse has moved recently. To work around that, use xdotool to move
the mouse every so often.