Email-app: Set IMAP FORWARDED flag/keyword

On succesfull forward, set IMAP FORWARDED flag/keyword.
Found things about that in:
https://tools.ietf.org/html/rfc5550#section-5.9
https://tools.ietf.org/html/rfc5788#section-3.4.2

Thunderbird, K9 and apparently PHP IMAP “imap_setflag_full” does this too.
This is a show stopper here…

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