Fix conversion between F64 and F32 #726
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Partially adresses #681 (comment)
Quantization/dequantization between F64 and F32 wasn't being handled properly, this was causing some issues.
F64 support in most GGML backends isn't really complete right now, so models using F64 weights can still make the program crash during inference. At least it's possible to convert F64 models to F32 with these changes.