Use Plaintext Header for SQLite

[insipx]

Closes #1029

• adds new struct/file EncryptedConnection that customizes the SQLite3 connection for SqlCipher & WAL mode
• SQLCipher salt is stored in a file next to sqlite3 db, in sqlite3.db3.sqlcipher_salt
• Adds lots more validation around SqlCipher connections
• removes some unused dependencies found with cargo machete
• tests for sqlcipher plaintext header

Would like to hear what people think about how the salt is stored -- open to suggestions on any better ways. Maybe the SDK can pass a file in? how it is now creates problems if the database file is moved/renamed/etc, but it should be clear the salt needs to be paired with it in the same directory.

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