Gameplay/physics using Emscripten

[Qaomen]

Description Due to server-side performance issues (mainly regarding mesh colliders and collision callbacks), we should use Emscripten to alleviate some of these problems. In short, if we rewrite most performance-heavy code in C++ and encapsulate this in Emscripten (like how the current physics implementation works), the code is expected to perform better.

Minimum Acceptance Criteria

• [ ] A C++ environment with Emscripten should be set up.
• [ ] Bullet should be included and functional.
• [ ] An interface should be defined in the TDD.
• [ ] Gameplay/physics-related code should be ported over and replace the Js implementation.

[Qaomen]

Closed because this is way out of scope. It requires a full rewrite of all of the server's game code (and some related code) and might as well be a completely separate project at that point. If any optimizations are needed in the future (apart from putting it on a separate thread to keep the server responsive), small WebAssembly modules may be the way to go