Nbt2yaml

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Fixed a bug where an entry that has a blank list would fail to be
parsed from YAML form.

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Happy new decade! Someone said they were using this. So I
resurrected it from a deleted hg repository, got it going on
Python 3 2020's style.

Also implemented the Long_Array datatype, patch courtesy
Mark Taylor.

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Modified the yaml rendering of TAG_Byte_array to render/
parse as a hex dump. This is a more readable/editable
format, also courtesy dratin0.

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Added support for the new TAG_Int_array type, courtesy
dratini0.

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Fixed -n option in yaml2nbt, previously was having
no effect and still gzipping output.

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Initial Release.