Remove the need for the RString buffer.

For most areas, the call to `c_str()` is plenty.

For `RageUtil`, it's just a matter of new and delete.

src/FileDownload.cpp

@@ -206,7 +206,7 @@ void FileTransfer::StartTransfer( TransferType type, const RString &sURL, const
 	m_wSocket.SendData( sHeader.c_str(), sHeader.length() );
 	m_wSocket.SendData( "\r\n" );
 
-	m_wSocket.SendData( sRequestPayload.GetBuffer(), sRequestPayload.size() );
+	m_wSocket.SendData( sRequestPayload.c_str(), sRequestPayload.size() );
 
 	m_sStatus = "Header Sent.";
 	m_wSocket.blocking = false;