Fix Bug

* NuGet: Fixed #26: Prig assembly shouldn't need InternalsVisibleToAttribute. => The internal type appeared at the stub signature, so modified to use the type `object`.
New Feature: Prig Setup Session

* NuGet: Added new command `Start-PrigSetup`. Make adding the indirection stub settings more easier because the operation was too complex. For example, you had to specify the module path that depends on the package version when add the setting for a GAC unregistered assembly.
Corrected Bugs

* All: Enhanced automated unit tests against regressions.
* CppAnonym: Merged the thread safety improvement.
* Swathe: Fixed #27: Test stalled if adding the indirection settings for all members of DateTime. => This is Swathe's problem, so fixed it and merged.
* Framework: Fixed #28: The indirect tests sometimes fail. => The weakness of the base library thread safety was its cause. Merged their modification and corrected to use them.