C++-demangle JS function names for emscripten'd code

If you compile a C++ project to JS using emscripten, you end up with JS function names like __ZN20ShaderConstantBuffer9SetFloat3EiRKN4math6float3E. Profiles of such code can be hard to read. We should run function names through a demangler so that they become readable; in the example that would be ShaderConstantBuffer::SetFloat3(int, math::float3 const&).

There's a demangle module on npm that can do this.

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