Also tidy up bridge notices during the login flow

Most evident at room creation, but more might need to be added

AKA "strangers". Should only happen to non-friends in rooms (not groups!)

But only if a path wasn't yet found for that image

Happens when logging into Line on Chrome somewhere else

But probably doing it wrong

Also forbid reactions

And possible mistake in member kicking

- Handle "decrypting" state of messages
- Handle lazy loading of emoji
- Better handle lazy loading of images/stickers
- Improve reliability of message sending, especially when sending
  several messages quickly
- Use m.sticker events for inbound stickers instead of m.image, and add
  a config to optionally use m.image if desired
- Use proper sizing for emoji, and add config to scale them since they
  are somewhat small
- Deduplicate stickers as best as possible (works until they get a
  different blob URL)
- Add config to disable bridging stickers/emoji
- Send m.notice for inbound messages of unknown type

For some reason, string-interpolating the result of chrono.parseDate
can set the time of day-only dates to noon, instead of midnight, which
is much more useful as a baseline time.

To get midnight, prepend "00:00" to all day-only date strings before
parsing them with chrono.parseDate.

If the connection to LINE is lost, when it comes back, and error dialog
appears. Detect that dialog and click it automatically.

The same detection works for any error dialog.

And invite them when turning it off

It can happen when the input stream closes after a timeout.

This fixes crashes that could otherwise happen when receiving animated
stickers.

Also bump the LINE extension version mentioned in SETUP.md (which the
bridge still works with, as far as I can tell)

TODO: poll other chats for read receipts

MAJOR TODO: Non-duplication of uploaded image data

Use their Unicode format, which is available in alt text

This also covers sticons, but only when a single one is sent as the sole
content of a message, in which case it behaves like a sticker/image.

Also set proper power levels

Instead, post notice that bridging the message may have failed.

Just update SETUP.md to mention the version, and remove the TODO for
adding phone number login, which LINE Chrome will disable soon.