Fix alignment of AEAD and Generic Hash states #32
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As noted by @jedisct1 in #29, the following should be aligned:
crypto_aead_aes256gcm_state
(on 16 bytes)crypto_generichash_blake2b_state
(on 64 bytes)crypto_onetimeauth_poly1305_state
(on 16 bytes, has not been wrapped)This PR adds a new support function
AlignedSlice
to create aligned slices,and uses it to correctly align the relevant slices.