CueList does not handle all 3 types of associated chunks types in LIST chunk

[SamVanheer]

CueList currently only handles the "labl" chunk type when loading the list chunk. The other two types are ignored, and since the loading code assumes all chunks are 12 bytes + label length + padding it can result in trying to read chunks in the middle of another chunk.

Ideally it should be possible to read all chunk types and properly handle the different sizes.

Since both websites cited in the source code for the file format are unreachable, i've found another source that lists the chunk format: https://sites.google.com/site/musicgapi/technical-documents/wav-file-format#ltxt

[markheath]

Would be happy to accept a PR for this