FFI enums use implicit values

[YoshiRulz]

Setting explicit values should be required in general, at least for enums used in wbox/native interop.
edit: This is Analyzer rule RCS1161. Also CA1008 for missing zero members, but wait for #4327.

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Also "unplugged" / no peripheral is missing. Added in c580766.

[vadosnaprimer]

Also "unplugged" / no peripheral is missing.

Which games require it?

[vadosnaprimer]

So zero info about games that need unplugged.

Also I'm not convinced someone working an a core would just randomly forget to update enums on one side while changing them on the other without any testing. MOST cores use enums with implicit values, so I have no idea why puae is being singled out here.

[YoshiRulz]

UAE is mostly explicit now, leaving this open as a reminder to enable that Analyzer rule and go through other cores.