Cli-proton-python

* new option --conn-use-config-file for read-config-file feature
* use conn-urls properly in all clients
* added support for handling on_released events
* added support for timeout to sender

* new option for enabling/disabling SASL

* message group id must be of type string
* message group sequence option support
* python3 compatibility fix for ClinetException handling in connnector
* do not process internal tx-related link open even
* replace null bytes in output with '\\0' placeholders
* raise exception when user is not validated on broker side

* message numbering fix
* use anonymous authentication mechanism in p2p tests

* address / amqp-to message field support
* authentication mechanisms option support
* existing bug references added to tests

* json message output format support added
* minor documentation and packaging changes
* API documentation generation