Fix bad tagging with script

Automate the repairing techniques described on http://rescene.wikidot.com/tutorial-mp3-cleanup with a script.

Many old mp3 files (< 2004) had only 2 tags: lyrics and id3v1. If it has id3v2, just remove it. You can use Mp3tag for this.
If the CRC doesn't match already, check whether the lyrics tag has Title, Album or Artist set. If so, add a space character at the end of the id3v1 of Title, Album or Artist. Even if there is no lyrics tag, just add a space to Album.
Very often some retaggers made spaces after the comment in the id3v1 tag and Mp3tag deleted this.
Very often retaggers change 0x20 to 0x00 or vice versa. See also Liquids.MP3.Hex.Tutorial.V1.0.eBOOK-LS

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