Refactor builtin's execute method for wider return types #242
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Previously, builtin's execute method was limited to ConstantValue. This meant that builtins could only return booleans, numbers or strings. It wasn't possible to return lists. This was an undue limitation on the possibilities of builtins.
This refactors the return type of execute to the more general MarkIntermediateResult. This should allow to return ListValue for further processing.