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/options.py

@@ -331,10 +331,6 @@ def parseOpts(overrideArguments=None):
         '--prefer-free-formats',
         action='store_true', dest='prefer_free_formats', default=False,
         help='Prefer free video formats unless a specific one is requested')
-    video_format.add_option(
-        '--max-quality',
-        action='store', dest='format_limit', metavar='FORMAT',
-        help='Highest quality format to download')
     video_format.add_option(
         '-F', '--list-formats',
         action='store_true', dest='listformats',