Consider writing compute intensive segments in Rust

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I believe Java suffers from not having value-type structs. We cannot pass a coordinate, nor return one, without allocating it on the heap. There are millions of allocations being done while rendering, which must unnecessarily slow down the process.

Consider the following options:

• Keep using Java only. Try to profile the program and find out whether it is possible to optimize.
• Re-write the rendering logic in Rust. The Java part of the program shall deal with input and preprocessing, and delegate the heavy lifting to the Rust program.
• Re-write the complete program in Rust.

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Options for Rust:
NBT library: https://github.com/PistonDevelopers/hematite_nbt
JNI, j4rs