v0.0.31

• Mime: List all message parts with a specfic Content-Disposition with MimeMessage.findContentInfo(ContenDisposition disposition).
• Mime: Retrieve an individual message part with MimeMessage.getPart(String fetchId)
• Bugfix: fetch individual message parts via IMAP with BODY[1.2] now works.
• MailClient: Download individual message parts with MailClient.fetchMessagePart(MimeMessage message, String fetchId).
• MailClient: events now provide reference to used MailClient instance, so that apps can differentiate between accounts.
• MessageBuilder: allow to specify user aliases and to handle + aliases and to differentiate between reply and reply-all in MessageBuilder.prepareReplyToMessage()
• ImapClient: Ensure that every Inbox has a MailboxFlag.inbox.