add SoftDemo examples

add example description for all examples (with word-wrap)
add the VoronoiFractureDemo, note that the collision are disabled after breaking constraints.
add optional GwenOpenGLTest, to make it easier to see Gwen user interface features.

test/GwenOpenGLTest/GroupBox.cpp

@@ -0,0 +1,21 @@
+#include "UnitTest.h"
+#include "Gwen/Controls/GroupBox.h"
+
+using namespace Gwen;
+
+class GroupBox2 : public GUnit
+{
+	public:
+
+	GWEN_CONTROL_INLINE( GroupBox2, GUnit )
+	{
+		Gwen::Controls::GroupBox* pGroup = new Gwen::Controls::GroupBox( this );
+		pGroup->Dock( Pos::Fill );
+		pGroup->SetText( "Group Box" );
+	}
+};
+
+
+
+
+DEFINE_UNIT_TEST( GroupBox2, L"GroupBox" );