Core/NetworkIO: Allow receiving packets bigger than buffer size and properly handle situations where not entire packet was read in one go

Core/Authserver: Restored authenticator functionality

src/server/shared/Packets/ByteBuffer.cpp

@@ -17,11 +17,16 @@
  */
 
 #include "ByteBuffer.h"
+#include "MessageBuffer.h"
 #include "Common.h"
 #include "Log.h"
 
 #include <sstream>
 
+ByteBuffer::ByteBuffer(MessageBuffer&& buffer) : _rpos(0), _wpos(0), _storage(buffer.Move())
+{
+}
+
 ByteBufferPositionException::ByteBufferPositionException(bool add, size_t pos,
                                                          size_t size, size_t valueSize)
 {