Improve sample architecture detection

[josh-feather]

• Samples are no longer automatically tagged with the x86 tag if they are not architecture specific
• Adds darwin inference for Macho-O samples; preventing Mach-O samples from being detonated on Windows VMs
• Consolidates architecture prediction and platform determination code by moving it into the File object
• Fixes a bug where PE32/PE32+ samples are always assigned x86/x64 tags
• Adds tests to validate platform and architecture detection code
• Disables magic type emulation for any PE that was not compiled for x86 or x64

[josh-feather]

Going to test this in our environment for a few days before marking as ready. Please feel free to provide feedback in the meantime.

[doomedraven]

thank you