Started work on custom NUnit addins

- Added ReSharper configuration
- Added project for NUnit addins
- UnitTests requires the new addin class library
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Work on unit tests
- Removed NUnit addin project
- Code cleanup in WrappedProcedure.cs
- Logic fixes in Function.tt
- GenProc.cs now leaves output files so the user can inspect them
- Removed timing code from GenProc.cs
- Started work on Compile and Execute steps