CompileInfoRootClass Property

This setting is required as Roslyn cannot produce compiled scripts with the user script class defined as a top level class. Thus all user defined classes are in fact nested classes with the root class named by Roslyn as "Submission#0". This leads to the complications when user wants to reference script class in another script. Specifically because C# treats "Submission#0" as an illegal class name.

C# helps the situation by allowing user specified root name RootClass, which is by default is "css_root".