Stable release 1.12.10

Some bugfixes, documentation improvements minor features; some internal rework.

- add --format=json2 for `mu find`, which produces a bit more 'idiomatic' json
- close notifications once done
- more informative mu4e-analyze-last-query (include all parameters)
- Make mu4e-maildir-shortcut and mu4e-bookmarks understand a property
 :hide-if-no-unread, which hides the maildir/bookmark from the main-view
  if there are no unread messages which the corresponding query.
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