group_decrypt
actual fun group_decrypt(session: OlmInboundGroupSessionPointer, message: ByteArray, plainText: ByteArray, messageIndex: MutableWrapper<UInt>): ULong
actual fun group_decrypt(session: OlmInboundGroupSessionPointer, message: ByteArray, plainText: ByteArray, messageIndex: MutableWrapper<UInt>): ULong
expect fun group_decrypt(session: OlmInboundGroupSessionPointer, message: ByteArray, plainText: ByteArray, messageIndex: MutableWrapper<UInt>): ULong