add initial examples, replacing the 'Demos/Demos3'. Will make it work cross-platform, OpenGL3/OpenGL2 and add more examples to it.

examples/CommonInterfaces/Common2dCanvasInterface.h

@@ -0,0 +1,15 @@
+#ifndef COMMON_2D_CANVAS_INTERFACE_H
+#define COMMON_2D_CANVAS_INTERFACE_H
+
+struct Common2dCanvasInterface
+{
+	virtual ~Common2dCanvasInterface() {}
+	virtual int createCanvas(const char* canvasName, int width, int height)=0;
+	virtual void destroyCanvas(int canvasId)=0;
+	virtual void setPixel(int canvasId, int x, int y, unsigned char red, unsigned char green,unsigned char blue, unsigned char alpha)=0;
+	virtual void refreshImageData(int canvasId)=0;
+
+};
+
+#endif //COMMON_2D_CANVAS_INTERFACE_H
+