- Updated our consumption of `RazorEngine` and `RazorTemplateEngine` to use `RazorProjectEngine` and its features.
- Updated service registrations to maintain existing services but to also register new ones.
- When moving `RazorViewEngine` to use `RazorProjectFileSystem` I had to add an unused constructor item in order to disambiguate the constructors.
- Updated tests to use `RazorProjectEngine` and `RazorProjectFileSystem`.
#7377
