Fix soundness issue of TransparentWrapper derive macro. #173
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May resolve #170.
Uses the compiler to check that all non-wrapped fields are actually 1-ZSTs, and uses Zeroable to check that all non-wrapped fields are "conjurable" (See discussion in the linked issue).
Additionally, relaxes the bound of
impl<T: Zeroable> Zeroable for PhantomData<T>
to allT: ?Sized
.