move ExplititEuler cloth solver to its own file, so it can be replaced by PDB, implicit euler etc

add wireframe toggle ('w' key)
add --paused command-line option to start simulation in paused mode
render cloth using drawPoints method

Demos3/CpuDemos/deformable/CpuSoftBodyDemo.h

@@ -64,9 +64,7 @@ public:
 		return "CpuSoftCloth";
 	}
 	
-	void	computeForces();
-	void	integrateEuler(float deltaTime);
-
+	
 	virtual void clientMoveAndDisplay();
 
 	static CpuDemo* MyCreateFunc()