[WIP] Dynamic compression for world data - #90
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Summary
Chunk/cube saving unconditionally uses GZIP for compression currently. This PR adds the ability for data to be compressed with different algorithms. Currently, only LZ4 is implemented. LZ4 was chosen because it is extremely fast, which eliminates most overhead when loading or saving world data. The algorithm is configurable so that server owners can tweak it or disable it entirely. The compression level can be changed at-will, and the world will be re-compressed with the new format as chunks and cubes are re-saved. I will also add something that re-compresses rarely used chunks/cubes when players haven't visited them in several IRL days.
LZ4 compression was also added to cube data, since CC was uploading over 10MB/s to players as they moved. This should significantly reduce network usage while keeping overhead low. We previously used GZIP to compress packets, but its overhead made the game unplayable.
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