For function parameters like frame, region, we're inconsistently calling them "parameters", "arguments", or "options".

I thought the correct way is calling frame an "argument", but after reading this FAQ (https://docs.python.org/3.9/faq/programming.html#faq-argument-vs-parameter), I think we should call frame a "parameter".

Thoughts? @GenericMappingTools/python @GenericMappingTools/python-maintainers