[lua and z] Changes to fix ambiguity in Z grammar, and unnecessary "using" in lua. #4406
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The lua grammar contained a "using" to something that is not needed for the CSharp target of the grammar. If not removed, a build error will occur for the new Antlr-ng tool.
For the Z grammar, there is an additional preprocessor grammar. The desc.xml is required to disambiguate which grammar for building and testing.