Commits on Mar 16, 2021

1. chacha20: remove Clone impls on RNGs …

   Removes `derive(Clone)` on `ChaCha*Rng*`.
   
   They date back to the original PR which added RNG support (#63).
   
   Allowing `Clone` on an RNG is problematic because the cloned RNG will
   have the same internal state, duplicating outputs which can be
   catastrophic in a cryptographic context.
   
   Instead, the `SeedableRng::from_rng` method can be used to "fork" one
   RNG from another, seeing a new RNG with an output from another:
   
   https://docs.rs/rand_core/0.6.2/rand_core/trait.SeedableRng.html#method.from_rng

   

   tarcieri committed Mar 16, 2021
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