Start improvement work on the CONTAM code

Begin work that will ultimately end with new unit tests, more
integrated code, and less dumb.
Streamline CONTAM object construction, add test
Simplify constructors for AirflowPath
Merge remote-tracking branch 'origin/contam-improvements' into airflow-network-builder

Conflicts:
	openstudiocore/src/airflow/CMakeLists.txt
	openstudiocore/src/airflow/PrjObjectsImpl.hpp
Add missed CONTAM test file