feat(preprocessor): preprocessor_priority execution order. #3303
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Between 3.x and 4.x we moved from combineLists to underscore.union in preprocessor.
Apparently combineLists was incorrect: the order of preprocessing changed in some cases.
Conceptually the order ought to depend upon the preprocessor, not the file.
Implement config.preprocessor_priority['preprocessor-name'] = priority, higher means run earlier.
Default priority is 0.
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