* 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.
- relates to #4445
- also relates to #4309 / fb07fee though restored and renamed files are slightly different
- latest Unobtrusive version; copy just one file under `wwwroot`
- add JavaScript file and CDN links to enable manual testing of `[Remote]` tests in `BasicWebSite`
- include renamed files for recreating the minimized JavaScript file manually