2.0.0

• Migrated to Swift 6 language mode, which requires Swift 6.2 (Xcode 26)
• Added Sendable conformance to Cryptor, Masterkey, MasterkeyFile, CryptorScheme, and FileNameEncoding
• Changed Cryptor, Masterkey, and MasterkeyFile to final classes
• Changed encryptContent(from:to:progress:) and decryptContent(from:to:progress:) to async throws with support for Task cancellation
• Added optional progress param to encryptContent() and decryptContent(), replacing implicit progress composition
• Fixed read, open, and write failures during content encryption/decryption being reported as success
• Fixed crash when decrypting truncated ciphertext, which now throws CryptoError.unauthenticCiphertext
• Removed public InputStream.read(maxLength:) extension and InputStreamError