[OTR] Use OTRL_PRIVKEY_FPRINT_HUMAN_LEN instead of hardcoded value
if it is available. [Thanks to Michael Kurz]
Details: https://sourceforge.net/p/otr/libotr/ci/e31c21d/tree/src/privkey.h?diff=fe57dd8
[OTR] Make call QFile::encodeName() outside of QtConcurrent::run().
[Thanks to Michael Kurz]
[OTR] Minimize the number of modal dialogs:
use other ways for notifying user (system messages in chat).
[OTR] Bump version and update change log.