Function ProcessLine

Processes a single line in the file. Args: filename: Filename of the file that is being processed. file_extension: The extension (dot not included) of the file. clean_lines: An array of strings, each representing a line of the file, with comments stripped. line: N

(filename, file_extension, clean_lines, line,
                include_state, function_state, nesting_state, error,
                extra_check_functions=[])