Add support for various algorithms for kdbx4

* Add SHA512 support to CryptoHash
* Add ChaCha20 support
* Add HMAC support
* Add new HmacBlockStream, used in KDBX 4
* Add support for ChaCha20 protected stream

src/format/KeePass2Writer.cpp

@@ -131,7 +131,7 @@ void KeePass2Writer::writeDatabase(QIODevice* device, Database* db)
         m_device = ioCompressor.data();
     }
 
-    KeePass2RandomStream randomStream;
+    KeePass2RandomStream randomStream(KeePass2::Salsa20);
     if (!randomStream.init(protectedStreamKey)) {
         raiseError(randomStream.errorString());
         return;