Previously, it was all controlled from the global init (applied to all projects), but some projects need different options. With these changes, you can disable the common options applied in the 'add_module' macro, and set your own if desired.
Added option: /Zf (Faster PDB generation); this was required as we enabled /MP. Without this, the compiler regularly fails to create a PDB.
Added option: /EHsc (Standard C++ exception handling).
Treat them as errors globally. Most of the time a warning is a bug, or problem in code that could be solved in a different (better) manner. Thirdparty code have this disabled. The warnings as errors option can be globally disabled through the CMake GUI, but this is not recommended.