* reply:
  UI for rich replies
  Reply to message instead of just quote
  Move quote code to quote helper

If you want an editable quote you can still copy to clipboard + paste as quote.
This commit works at a protocol level, but there is no UI to show that you are
replying or to let you cancel a reply.

* start-join:
  Unify add contact and join channel
  If a MUC address is entered as a contact, join it

* default-stickers:
  Default sticker download offer on first start
  Scan files so they show up under images
  Send SIMS with hashes and filename
  sha-1 is the standard name sha1 is just for bob
  Send cid with known URL without uploading
  Option to download default stickers and save their cid and url in database

Permanently stores the hash so you never see that media again.

Don't change if already custom label by XHTML-IM or similar

If link is for current conversation JID, then don't show display name

Instead of making the user know what kind of JID they have, just let them enter
it and we can figure that out.

Instead of forcing them to add a contact or bookmark, make it optional with a
checkbox (default checked).

Instead of assuming they want to message the contact, allow them to choose to
call instead (coupled with PSTN gateway features this is effectively a dialler).