Add serde support for deserializing long arrays

[caelunshun]

This allows hematite-nbt to be used for deserializing 1.13.2 region files.

Resolves #32.

[atheriel]

Thanks for taking the initiative on this. If I understand correctly, this only implements deserialziation, so it does not completely resolve #32 (which would also require serialization support).

Have you successfully deserialized a region file using this patch?

[caelunshun]

Thanks for taking the initiative on this. If I understand correctly, this only implements deserialziation, so it does not completely resolve #32 (which would also require serialization support).

That's correct. The root issue for this is #27, which means that a long array would be written as a TAG_List rather than a TAG_Long_Array. The same happens with int/byte arrays as well.

Have you successfully deserialized a region file using this patch?

Yep - see this.

[atheriel]

Nice to see some ongoing work on Minecraft in Rust, thank you.