Adjust plaintext header size rules

- for sqlcipher the plaintext header size must be a multiple of the AES blocksize (16 bytes)
- for legacy chacha20 (resp. sqleet) the plaintext header size can be an arbitrary value greater or equal 0
- for non-legacy chacha20, ascon128, and aegis the plaintext header size can be 0 or a value greater or equal between 24

The upper limit for the plaintext header size is currently 100. In theory, it could be limited by the page size reduced by the number of reserved bytes.