v5.0.0-beta.1

Summary:

• Changes architecture to use codec
• Adjusts KDF iteration back to 256K
• Rekey support for databases in WAL mode with concurrent connections
• Journal spill behavior is now locked down to prevent plaintext writes
• Fixed a bug where cipher_hmac_fast_kdf could write the page HMAC past the reserved area
• Improved error handling and reporting for rekey failures
• Fixed shared cache connections for encrypted databases
• Added PRAGMA cipher_selftest for verifying internal implementations
• BREAKING CHANGES - see CHANGELOG.md and release announcement