imap client: implement CREATE and APPEND. Fix APPEND in imap4d.

* imap4d/append.c (imap4d_append0): Use
mu_message_from_stream_with_envelope with crafted envelope.  The effect is
that the envelope of the message always reflects the actual sender, as
deduced from the header (X-Envelope-Sender, Sender, From, in that order)
and the date given with the APPEND command (or current date/time, if not
given).
* imap4d/tests/append00.at: Reflect changes in the envelope.
* imap4d/tests/append01.at: Likewise.
* imap4d/io.c (io_format_completion_response): Call imap4d_sync to
emit eventual non-tagged responses before the tagged one.

* include/mailutils/envelope.h (mu_envelope_set_destroy): New proto.
* include/mailutils/header.h (MU_HEADER_SENDER): Remove duplicate define.
* include/mailutils/imap.h (mu_imap_mailbox_create)
(mu_imap_append_stream_size,mu_imap_append_stream)
(mu_imap_append_message,mu_imapio_send_flags)
(mu_imapio_send_time): New protos.
* include/mailutils/imapio.h (mu_imapio_send_literal): Remove proto.
(mu_imapio_send_literal_string)
(mu_imapio_send_literal_stream): New protos.
* include/mailutils/message.h
(mu_message_from_stream_with_envelope): New proto.
* include/mailutils/sys/imap.h (MU_IMAP_CLIENT_APPEND_RX): New state.
* include/mailutils/sys/message_stream.h (_mu_message_stream)
<envelope>: Rename to envelope_string.
<construct_envelope>: New member.

* libmailutils/imapio/literal.c: Remove.
* libmailutils/imapio/litstream.c: New file.
* libmailutils/imapio/litstring.c: New file.
* libmailutils/imapio/time.c: New file.
* libmailutils/imapio/Makefile.am: Add new files.
* libmailutils/imapio/flags.c (mu_imapio_send_flags): New function.
* libmailutils/imapio/qstring.c (mu_imapio_send_qstring_unfold): Use
mu_imapio_send_literal_string.

* libmailutils/mailbox/envelope.c (mu_envelope_set_destroy): New
function.
* libmailutils/stream/message_stream.c
(mu_message_from_stream_with_envelope): New function.
(mu_stream_to_message): Rewrite as an alternative entry point to the
above.

* libproto/imap/Makefile.am: Add new files.
* libproto/imap/appmsg.c: New file.
* libproto/imap/appstr.c: New file.
* libproto/imap/appstrsiz.c: New file.
* libproto/imap/mbcreate.c: New file.

* mu/imap.c: Implement create and append.

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