Fix magic enum slow compilation times #4113
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Introducing magic_enum slowed down our compilation times. The reason for that is that it's a library relying heavily on templates and it was used from inline methods in a header file. That resulted in a lot of unnecessary recompilations of the same code. This PR moves that implementation to a .cpp file, so it only needs to be compiled once. In addition it also solves the annoying macro redefinition warnings.