qt: Add UI to configure touchscreen parameters

This allows adjusting the finger, diameter, and angle of the emulated touchscreen. It also provides a warning to the user about what changing these parameters can do.

src/yuzu/configuration/configure_touchscreen_advanced.h

@@ -0,0 +1,31 @@
+// Copyright 2016 Citra Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include <memory>
+#include <QDialog>
+#include <QWidget>
+#include "yuzu/configuration/config.h"
+
+namespace Ui {
+class ConfigureTouchscreenAdvanced;
+}
+
+class ConfigureTouchscreenAdvanced : public QDialog {
+    Q_OBJECT
+
+public:
+    explicit ConfigureTouchscreenAdvanced(QWidget* parent);
+
+    void applyConfiguration();
+
+private:
+    /// Load configuration settings.
+    void loadConfiguration();
+    /// Restore all buttons to their default values.
+    void restoreDefaults();
+
+    std::unique_ptr<Ui::ConfigureTouchscreenAdvanced> ui;
+};