Qt: Move post processing to its own setting category

src/duckstation-qt/postprocessingshaderconfigwidget.h

@@ -1,8 +1,11 @@
 #pragma once
 #include "frontend-common/postprocessing_shader.h"
 #include <QtWidgets/QDialog>
+#include <QtWidgets/QWidget>
 
-class PostProcessingShaderConfigWidget : public QDialog
+class QGridLayout;
+
+class PostProcessingShaderConfigWidget : public QWidget
 {
   Q_OBJECT
 
@@ -10,17 +13,38 @@ public:
   PostProcessingShaderConfigWidget(QWidget* parent, FrontendCommon::PostProcessingShader* shader);
   ~PostProcessingShaderConfigWidget();
 
+  QGridLayout* getLayout() { return m_layout; }
+
 Q_SIGNALS:
   void configChanged();
   void resettingtoDefaults();
 
 private Q_SLOTS:
-  void onCloseClicked();
   void onResetToDefaultsClicked();
 
-private:
+protected:
   void createUi();
 
   FrontendCommon::PostProcessingShader* m_shader;
+  QGridLayout* m_layout;
+};
+
+class PostProcessingShaderConfigDialog : public QDialog
+{
+  Q_OBJECT
+
+public:
+  PostProcessingShaderConfigDialog(QWidget* parent, FrontendCommon::PostProcessingShader* shader);
+  ~PostProcessingShaderConfigDialog();
+
+Q_SIGNALS:
+  void configChanged();
+
+private Q_SLOTS:
+  void onConfigChanged();
+  void onCloseClicked();
+
+private:
+  PostProcessingShaderConfigWidget* m_widget;
 };