Decompression needs to be threaded

[oidro]

This decompression:

VoxelGame/sourcecode/chunk/client/src/lib.rs

Line 142 in a6cbe3b

let received_chunk_data: ChunkData = decode_compressed(&*data);

and this lock:

VoxelGame/sourcecode/chunk/client/src/lib.rs

Line 144 in a6cbe3b

let mut chunk_data_write = loaded_chunk.data.write().unwrap();

currently run in the main thread, which is killing performance (~6ms for the decompression, and ~1ms for the lock).
These steps need to be moved into the chunk-updating thread(s), which hopefully shouldn't be too difficult.