Introduced options:
- Show unencrpyted Messages will make decryptMessage return successful instead of error on a not encrypted message, so the message stays as is
- End OTR connection on conversation leave will terminate the OTR session when conversation partner leaves e.g. going offline(his session will be lost and not recoverable on OTR clients) When not enabled: <User-X> has ended the OTR session. You should do the same. When enabled: Terminating OTR session <User-X> has ended the OTR session. Your OTR session has been ended as well