Rename refactoring plus some reorg.
Refactor of Commissioning.Data assembly. Added NUnit to build

- Refactored the Commissioning.Data assembly.
- Added NUnit to build process (for fun). Tests now run on build.
- Removed AnyCPU platform solution wide as its simplest way to prevent
projects targeting AnyCPU instead of x86
- Added MSBuild.Community.Tasks.dll