* Exploratory pass at adding support for macro params in filter operands
* whitspace correction
* rename varInfo to varTree for disambiguation
* Refactored parseMacroInvocation to be re-usable, performance improvements for variables with no params and tests
* Revised regular expression and removed spurious white space changes
* Revised regular expression and removed spurious white space changes
* More whitespace cleanup and added more tests for edge cases
* Added test for macro params with square brackets
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