Enhance macro support in parser

[worksofliam]

Improve handling of macros in the parser, including new tests to verify functionality with defined macros.

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• tests/rpgle/copy4.rpgleinc: Language not supported

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language/parser.js:276

• [nitpick] Consider renaming 'directIfScope' to 'conditionalScopeStack' for better clarity.

let directIfScope = [];