- In this PR we do away with `CreateDesignTime` on the `RazorProjectEngine`. Instead we now have an overload that takes in a configuration and does the right thing.
- Updated `RazorProjectEngineBuilder` to have a configuration.
- Updated `RazorConfiguration` to only have a `Default`. Setting up a razor configuration for design time now requires calling code to construct the configuration manually.
- These contracts introduce a new `RazorProjectEngine` concept which allows for users to configure 1 entity that's responsible for the RazorEngine and project.
- The `RazorProjectEngineBuilder` has a collection of features that are dispersed on the created `RazorEngine` and the `RazorProjectEngine`.
- Included a complete implementation of `RazorProjectEngine` it introduces the extension points for the project engine. The primary one includes the `IRazorImportFeature`, the default behavior is to return 0 imports.
- Included a complete project engine builder implementation.
#1828
N. Taylor Mullen