The CDC connector now uses a non-blocking socket for the reads. This
allows the possibility of adding read timeouts.
Added some utility functions for dealing with GTIDs and delayed the
reading of the first row.
The static library cannot be linked to the Jansson static library by
CMake. This appears to be a limitation in CMake and a manual combination
of the two files would be required.
For the time being, the connector is only built as a shared library.
