Clean up the proxy project files by adding a 'proxy.props' file to the root of the repository with common properties for proxy projects.
Update all proxy projects to reference the common 'proxy.props' file and remove the common properties from the individual project files.
Xunit assumes all necissary test information is contained within the serialized data-member. Instead of calculating the iteration number, the value is explicitly added to the data-member rows.
Provide capture and reply proxy project for 'Github.Authentication'.
- [x] Provide capture proxy.
- [x] Provide replay proxy.
- [x] Extend `Microsoft.Alm.Authentication.Test.UnitTestBase` with specialized support for GitHub vua `IGui`.