ci: fix avx issues on arm

[braindigitalis]

This adds more sanity checks to the cmake, and a second sanity check for architecture type to the .h file (for if the user tries to force an unsupported AVX on non-intel/amd). It also moves the isa_detection.h from discordvoiceclient.h to discordvoiceclient.cpp so that the user of the library isnt expected to have to set e.g. T_fallback or similar. There was never any legitimate need for the user to have to do that.

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