Now the user is able to customize the recipients name, email, subject
and date headers style in the message viewer's header by customizing the
'realname', 'email', 'subject' and 'date' style objects respectively.
Draw individual components of header fields according to the configured
styleset.
Changelog-added: New styleset objects available to customize special
headers in the message viewer.
Signed-off-by: Sahil Gautam <printfdebugging@gmail.com>
Acked-by: Robin Jarry <robin@jarry.cc>