BackendIMAP - Missing extra spaces
Move function to TimeZoneUtil
Extract MakeUTCDate function to Utils
Extract ParseTimezone function to Utils
TimezoneUtil - New function and capitalize public function
BackendIMAP::GetMessage - Initial support for receiving meetting notifications. Reminders are not yet implemented and DiffBackend doesn't support MeetingResponses so it's not really useful
BackendIMAP::MeetingResponse - Empty function
BackendIMAP::GetMessage - Never truncate MIME messages, iOS devices are showing broken messages and missing attachments