This is an PGP/MIME format produced by Microsoft Exchange and ProtonMail IMAP/SMTP Bridge,
described in detail in https://tools.ietf.org/id/draft-dkg-openpgp-pgpmime-message-mangling-00.html
This patch adds seamless support for "Mixed Up" Encryption, repairing
mangled Autocrypt messages without notifying the user.
the document standards.md exist since a long time
to get an overview but also a nice reference to get some links.
however, its placement in the android-repo is a bit unlogical,
probably comes from a time where there was only one implementation :)
as ios and desktop use the same standards and as
all acutal implementations are in the core,
we move it to the core repo.
android can have a link to the new place.
