Infers the 'empty' model prefix for complex types that are read from the value
providers. This gives us better defaults when using the parameter object
pattern with respect to swagger/API explorer.
* Clean up unnecessary workarounds on the build project.
* Remove the need to specify the content root relative to the solution
and use a solution based on an assembly level attribute on the test
assembly created at build time.
* Remove non parameterless constructors.
* Add support for creating specialized factories from the base factory
and keep track of "child" factories for disposal.
* Add support for creating clients that handle cookies and redirects
automatically.