NOISSUE add option to open global settings from instance settings

This should hopefully giude people towards using the right thing.

application/MultiMC.cpp

@@ -66,6 +66,8 @@
 #include <ganalytics.h>
 #include <sys.h>
 
+#include "pagedialog/PageDialog.h"
+
 
 #if defined Q_OS_WIN32
 #ifndef WIN32_LEAN_AND_MEAN
@@ -1088,6 +1090,20 @@ void MultiMC::controllerFailed(const QString& error)
     }
 }
 
+void MultiMC::ShowGlobalSettings(class QWidget* parent, QString open_page)
+{
+    if(!m_globalSettingsProvider) {
+        return;
+    }
+    emit globalSettingsAboutToOpen();
+    {
+        SettingsObject::Lock lock(MMC->settings());
+        PageDialog dlg(m_globalSettingsProvider.get(), open_page, parent);
+        dlg.exec();
+    }
+    emit globalSettingsClosed();
+}
+
 MainWindow* MultiMC::showMainWindow(bool minimized)
 {
     if(m_mainWindow)