This follows discussions from #3413. Followup commits add clang-format file, script and blame ignore lists.
FEXCore includes was including an FHU header which would result in compilation failure for external projects trying to link to libFEXCore. Moves it over to fix this, it was the only FHU usage in FEXCore/include NFC
This will also be used by FEX ARM64EC module.
This can also be used by the FEX ARM64EC module.