v0.2.0

• ImapClient now processes tasks sequentially, removing the dreaded StreamSink is bound to a stream exception when accessing ImapClient from several threads.
• Highlevel API for adding mail messages with MailClient.appendMessage(...) / .appendMessageToFlag(...) and MailClient.saveDraftMessage(...)
• Searching for messages is now easier than ever with MailClient.search(MailSearch) and SearchQueryBuilder- #109
• Sent messages are now appended automatically when using the high level MailClient.sentMessage(...) call unless setting the appendToSent parameter to false.
• Create IMAP search criteria with SearchQueryBuilder and conduct common searches with MailClient.search(MailSearch)
• Fixed detection of audio media types
• Added CRAM-MD5 authentication support for SMTP - #108
• Added XOAUTH2 authentication support for SMTP - #107
• Create MessageSequence from list of mime messages with MessageSequence.fromMessages(List<MimeMessage>)
• You can now check with the highlevel API if you can send 8bit messages with MailClient.supports8BitEncoding() and set the preferred encoding with MailClient.buildMimeMessageWithRecommendedTextEncoding(MessageBuilder).
• MessageBuilder now can recommend text encodings with MessageBuilder.setRecommendedTextEncoding(bool supports8Bit) and sets content types automatically depending on attachments.
• Access attachment information easier using the MessageBuilder.attachments field and the AttachmentInfo class.
• You can send a MessageBuilder instance instead of a MimeMessage with MailClient.sendMessageBuilder(...).
• Breaking API changes:
  • SmtpClient.login() is deprecated, please use the better named SmtpClient.authenticate() instead, e.g.:
    await smtpClient.authenticate(userName, password, AuthMechanism.login)
  • BodyPart.id is renamed to BodyPart.cid to make the meaning clearer.