We can actually name this as `ClassLoader` and hide the prelude `ClassLoader`. We are already hiding prelude `Class` so we just need to add this in the imports in Lang.fr, Reflect.fr, NativeGen.fr and Main.fr: `import frege.Prelude hiding (Class, ClassLoader)`.

The bigger goal is that we should merge back Lang.fr and Reflect.fr into Frege itself replacing the current definitions.