Add touch input support, add fast scrolling support for coverflow display mode, fix use after free bug in banner list mode

arm9/source/gui/input/TouchInputSource.h

@@ -0,0 +1,24 @@
+#pragma once
+#include "common.h"
+#include <nds/input.h>
+#include "ITouchInputSource.h"
+#include "sharedMemory.h"
+
+/// @brief Input source from the physical DS touch screen.
+class TouchInputSource : public ITouchInputSource
+{
+public:
+    bool Sample(Point& touchPosition) const override
+    {
+        if (SHARED_KEY_XY & (1 << 6))
+        {
+            touchPosition = Point(0, 0);
+            return false;
+        }
+        else
+        {
+            touchPosition = Point(SHARED_TOUCH_X, SHARED_TOUCH_Y);
+            return true;
+        }
+    }
+};