Merge multi-touch gestures event branch

This is a squashed commit of the SOC2017_GESTURES branch from
https://github.com/prashantkn94/wxWidgets.git

Closes https://github.com/wxWidgets/wxWidgets/pull/551

samples/event/gestures.h

@@ -0,0 +1,39 @@
+#ifndef _WX_GESTURES_H_
+#define _WX_GESTURES_H_
+
+#include "wx/wx.h"
+
+class MyGestureFrame : public wxFrame
+{
+public:
+    MyGestureFrame();
+
+    void OnGesture(wxGestureEvent& event);
+    void OnQuit(wxCloseEvent& event);
+
+private:
+    wxTextCtrl *m_logText;
+};
+
+class MyGesturePanel : public wxPanel
+{
+public:
+    MyGesturePanel(MyGestureFrame* parent);
+
+    void OnPaint(wxPaintEvent& event);
+    void OnPan(wxPanGestureEvent& event);
+    void OnZoom(wxZoomGestureEvent& event);
+    void OnRotate(wxRotateGestureEvent& event);
+    void OnTwoFingerTap(wxTwoFingerTapEvent& event);
+    void OnLongPress(wxLongPressEvent& event);
+    void OnPressAndTap(wxPressAndTapEvent& event);
+
+private:
+    wxBitmap m_bitmap;
+    wxPoint2DDouble m_translateDistance;
+    wxAffineMatrix2D m_affineMatrix;
+    double m_lastZoomFactor;
+    double m_lastRotationAngle;
+};
+
+#endif // _WX_GESTURES_H_