Use the M3U index as concurrency index and generalize regex parsing

[sonroyaalmerol]

Currently, the concurrency index is set to each of the streams per m3u file individually. This doesn't make sense as the concurrency limit is usually set to each of the m3u files and not the streams within the m3u files.

Also, current regex parsing does not take into account those m3u attributes that doesn't follow the standards.