Commits on Nov 29, 2023

1. Add ConstantTimeSelect and ConstantTimeClone traits …

   `ConstantTimeSelect` is intended as a replacement to
   `ConditionallySelectable`, which is preserved but deprecated. It
   replaces the previous `Copy` bound with a bound on a new
   `ConstantTimeClone` marker trait, which allows the trait to be impl'd
   for heap-allocated types.
   
   No existing impls of `ConditionallySelectable` have been removed,
   however a blanket impl of `ConstantTimeSelect` for
   `T: ConditionallySelectable` has been added, allowing the two traits to
   interoperate and for `ConstantTimeSelect` to work on all types which
   currently impl `ConditionallySelectable`.
   
   `ConstantTimeClone` likewise has a blanket impl for all types which impl
   `Copy`.
   
   `CtOption`'s combinator methods have been changed to bound on
   `ConstantTimeSelect` which unlocks using them with heap-allocated types,
   which otherwise is a major limitation. In theory these changes are all
   backwards compatible due to the blanket impl, which should allow all
   types which previously worked to continue to do so.
   
   Closes dalek-cryptography#63, dalek-cryptography#94

   

   tarcieri committed Nov 29, 2023
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