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
Move CONTAM files to airflow subdir
Change Contam.i ifdef guards
Add surface network builder, rename files
Continue airflow renaming, add network build test
Flesh out surface network builder for CONTAM/AFN
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
Streamline PlrLeak2 construction
Remove QVector from PRJ model
Switch to C++11 enum classes, add more tests
Roll back C++11 enums for CONTAM paths and zones
Add the contam subdirectory again
Remove std::cout, old functions
Clean up for pull request
Use average area in CONTAM ForwardTranslator
Merge remote-tracking branch 'remotes/jasondegraw/airflow-network-builder' into develop
Clean up PrjReader