Part of #45186. Implement a PacketsDefinition._clean_lines(lines: Iterable[str]) -> Iterable[str] classmethod that removes comments, blank lines and leading/trailing whitespace from the input line-by-line. If the input ends while inside a block comment (/* */), raise ValueError.
alienvalkyrie 
Part of #45186. Implement a PacketsDefinition._clean_lines(lines: Iterable[str]) -> Iterable[str] classmethod that removes comments, blank lines and leading/trailing whitespace from the input line-by-line. If the input ends while inside a block comment (/* */), raise ValueError.