More AST refactoring -- each of the code wrapping classes

just returns a resource from its evaluate() method, and
all of the work is done in the evaluate_code method.  This
makes the code cleaner, because it means 1) evaluate() has
the same prototype as all of the other AST classes,
2) evaluate() is no longer called indirectly through
the Parser Resource class, and 3) the classes themselves
are responsible for creating the resources, rather than
it being done in the Compile class.

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