Supplementary Feature

* All: Redefined the build configuration of the C++ project in the product code side, because it doesn't need the static condition of .NET runtime.
* All: Updated README.md to use the supplementary tool.
* prig: This is the supplementary tool. Now, it has just the one feature called 'Runner': test environment preparer, but I plan to add other features(e.g. 'Stubber': auto stub generator).