- Removed verbose `Create` methods in favor of the `RazorParserOptionsBuilder`. This is similar to how the `RazorEngine` functions.
- Added a `CreateDesignTime` method.
- Updated existing tests to use new Create syntax.
#1510
This change removes the default usings for 'System' and
'System.Threading.Tasks' and adds them to the MVC template engine.
This is preparation for removing this feature from the razor options, I
wanted to get all of the intentional diff out of the way.