bring in new version of Box2D and update #include paths

--HG--
branch : box2d-update

src/modules/physics/box2d/Box2D/Dynamics/b2TimeStep.h

@@ -0,0 +1,35 @@
+/*
+* Copyright (c) 2006-2009 Erin Catto http://www.gphysics.com
+*
+* This software is provided 'as-is', without any express or implied
+* warranty.  In no event will the authors be held liable for any damages
+* arising from the use of this software.
+* Permission is granted to anyone to use this software for any purpose,
+* including commercial applications, and to alter it and redistribute it
+* freely, subject to the following restrictions:
+* 1. The origin of this software must not be misrepresented; you must not
+* claim that you wrote the original software. If you use this software
+* in a product, an acknowledgment in the product documentation would be
+* appreciated but is not required.
+* 2. Altered source versions must be plainly marked as such, and must not be
+* misrepresented as being the original software.
+* 3. This notice may not be removed or altered from any source distribution.
+*/
+
+#ifndef B2_TIME_STEP_H
+#define B2_TIME_STEP_H
+
+#include <Box2D/Common/b2Settings.h>
+
+/// This is an internal structure.
+struct b2TimeStep
+{
+	float32 dt;			// time step
+	float32 inv_dt;		// inverse time step (0 if dt == 0).
+	float32 dtRatio;	// dt * inv_dt0
+	int32 velocityIterations;
+	int32 positionIterations;
+	bool warmStarting;
+};
+
+#endif