- Updated all implementations of `IImportProjectFeature`; for MVC I went ahead and made a single project item that's always returned for MVC scenarios. That project item is smart about returning its content in a light-weight stream fashion.
- Had to add a `RazorProjectItem` => `RazorSourceDocument` conversion mechanic into `DefaultRazorProjectEngine`.
- Added tests for `DefaultRazorProjectItem.ConvertToSourceDocument`.
- Removed the `ProjectEngine` API from `VisualStudioRazorParser`. This was unrelated but was missed feedback.
#2068
- Changed all existing APIs to utilize `RazorProjectFileSystem`. This was possible because `RazorProjectFileSystem` inherits from RazorProject.
- Renamed `FileSystemRazorProject` to `DefaultRazorProjectFileSystem`.
- Renamed FileSystemRazorProjectItem` to `DefaultRazorProjectItem`.
- Obsoleted `RazorProject.Create`
#1828
N. Taylor Mullen