Add Unsafe operations #317
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Add Unsafe operations to Cstruct, and the ppx generator.
Unsafe accessors are useful when it can be guaranteed that we will not access any values out of bounds, in order to not spend time on bounds checks.
For example if we wrap a cstruct
xin anX.t, which is always of the right size, we do not have to force clients of that module to bounds check every access.