move shaders to .glsl files and stringify to .h file.

add crude screenshot facility (using F1 key), it can also be used for debugging
start with shadows using shadowmap, not working yet
add experimental 'ignore' body index in raycast, using b3HitInfo.m_m_hitResult2

Demos3/GpuDemos/shadows/ShadowMapDemo.h

@@ -0,0 +1,36 @@
+#ifndef SHADOW_MAP_DEMO_H
+#define SHADOW_MAP_DEMO_H
+
+#include "../GpuDemo.h"
+
+class ShadowMapDemo : public GpuDemo
+{
+	struct ShadowMapDemoInternalData* m_shadowData;
+
+public:
+
+	ShadowMapDemo();
+	virtual ~ShadowMapDemo();
+
+	virtual const char* getName()
+	{
+		return "ShadowMapDemo";
+	}
+	
+	virtual void    initPhysics(const ConstructionInfo& ci);
+	
+	virtual void    exitPhysics();
+	
+	virtual void renderScene();
+	
+	virtual void clientMoveAndDisplay();
+
+	static GpuDemo* MyCreateFunc()
+	{
+		GpuDemo* demo = new ShadowMapDemo;
+		return demo;
+	}
+
+};
+
+#endif //SHADOW_MAP_DEMO_H