STAR-486 Implement support for statistic callbacks

STAR-229: automatically run unit tests

STAR-42: add unit tests for RIST wrapper

STAR-111 Add scoped logging and update librist version

This fix adds a data member to keep track of logging ownership, fixing a
memory leak due to not freeing memory allocated by rist_logging_set().
It also updates to the latest librist version.

STAR-82: disconnected callback

Move NetworkConnection into class namespaces

Cleanup