Can use thread to reply to a whisper without command

Threads for whispers

Allow users to opt-in to JID discoverability

So that we can actually build out this feature and turn it on in a way that
respects users right to not want this.

Merge branch 'stats'

* stats:
  Add stats counter for cmd list fetch
  Add stats counter for adhoc-bot cmd run
  Add stats counter for adhoc-bot msg received
  Add stats counter for service start up
  Add stats counter for malformed cacheobb url

Add stats counter for cmd list fetch

Add stats counter for adhoc-bot cmd run

Add stats counter for adhoc-bot msg received

Add stats counter for service start up

Add stats counter for malformed cacheobb url

Cache OOB items for outgoing messages

Since backends may want to send these URLs on further.

Include the command payload item along with the bot prompt

Do not reflect errors

Never reply to an error with an error, instead just ignore the stanza.

Not using this msg

die on component connection error

Don't tell a number "not joined" more than once per hour

Real humans will only notice a bit and bots will loops much less.

Logs for service thread deaths and deadlock checks

Too many domains for this tag to be useful anymore

Fetch VCard4 data from multiple possible sources

If direct-message-route asks for the VCard4 node of a user, fetch possible
vcard4, nickname, and vcard-temp from the user and synthesize into one big vcard
to return to the SGX.

Don't pile up rejoins on errors

Add audio/{amr,AMR} to list of known mime types