RMG-Input: use only needed headers from RMG-Core

Source/RMG-Input/UserInterface/OptionsDialog.cpp

@@ -11,10 +11,13 @@
 
 #include <QFileDialog>
 #include <QMessageBox>
-#include <RMG-Core/Core.hpp>
 
 #include <SDL.h>
 
+#include <RMG-Core/Emulation.hpp>
+#include <RMG-Core/Settings.hpp>
+
+
 using namespace UserInterface;
 
 OptionsDialog::OptionsDialog(QWidget* parent, OptionsDialogSettings settings,