Remove the --max-quality option

It doesn't work well with 'bestvideo' and 'bestaudio' because they are usually before the max quality.
Format filters should be used instead, they are more flexible and don't require the requested quality to exist for each video.

youtube_dl/utils.py

@@ -1109,15 +1109,6 @@ def shell_quote(args):
     return ' '.join(quoted_args)
 
 
-def takewhile_inclusive(pred, seq):
-    """ Like itertools.takewhile, but include the latest evaluated element
-        (the first element so that Not pred(e)) """
-    for e in seq:
-        yield e
-        if not pred(e):
-            return
-
-
 def smuggle_url(url, data):
     """ Pass additional data in a URL for internal use. """