447637: MailUtility: add support for adding attachments to existing mime
messages 

Change-Id: Iaba7c9960e231a8ffd3fc69dc877bec93d1d78e7
Task-Url: https://bugs.eclipse.org/bugs/show_bug.cgi?id=447637
Reviewed-on: https://git.eclipse.org/r/35466
Tested-by: Hudson CI
Reviewed-by: Christoph Schwank <christoph.schwank@bsiag.com>
(cherry picked from commit ea8a58a478e7ee6488ec9ea3da564a5f3fd043fc)
Reviewed-on: https://git.eclipse.org/r/35568
448648: MailUtility.collectMailParts: inline attachments are not

collected

Change-Id: I4f0c47496de869b944846b0fd08b720b8fe5f944
Task-Url: https://bugs.eclipse.org/bugs/show_bug.cgi?id=448648
Reviewed-on: https://git.eclipse.org/r/35482
Tested-by: Hudson CI
Reviewed-by: Bruno  Koeferli <bruno.koeferli@bsiag.com>
cherry pick from 4.1.x
Reviewed-on: https://git.eclipse.org/r/35569
Fixed typo in MailUtility: attachements --> attachments

Change-Id: I8c9f1f50420807ed1766a07120095c71bd4fc435

Reviewed-on: https://git.eclipse.org/r/35483
Tested-by: Hudson CI
Reviewed-by: Bruno  Koeferli <bruno.koeferli@bsiag.com>
cherry pick from 4.1.x
Change-Id: I52fab3f638bc3095fd25dc73bf3181b2188acbc1
Reviewed-on: https://git.eclipse.org/r/35574