WavChunkType's `code` is case sensitive

When the WavChunkType is read for a chunk in a WAV, we look it up using the code:

    public synchronized static WavChunkType get(final String code) {
        if (CODE_TYPE_MAP.isEmpty()) {
            for (final WavChunkType type : values()) {
                CODE_TYPE_MAP.put(type.getCode(), type);
            }
        }
        return CODE_TYPE_MAP.get(code);
    }

This is a case sensitive comparison.

I have noticed the tagger kid3-cli creates chunk type codes with upper case, e.g. "ID3". I looked into this further and it turns out this was the (old) behaviour of a library called Taglib (https://taglib.org/). This is used in a lot of software, e.g. Traktor.

Refs:

I wonder if jaudiotagger should be more tolerant of this?

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