Add PhysicsEffects to Extras. The build is only tested on Windows and Android.

The Android/NEON optimized version of Physics Effects is thanks to Graham Rhodes and Anthony Hamilton, See Issue 587

Extras/PhysicsEffects/include/BulletPhysicsEffects/btLowLevelConstraintSolver2.h

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+/*
+   Copyright (C) 2010 Sony Computer Entertainment Inc.
+   All rights reserved.
+
+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 __BT_LOW_LEVEL_CONSTRAINT_SOLVER2_H
+#define __BT_LOW_LEVEL_CONSTRAINT_SOLVER2_H
+
+#include "BulletDynamics/ConstraintSolver/btSequentialImpulseConstraintSolver.h"
+
+
+
+
+#include "LinearMath/btScalar.h"
+#include "BulletMultiThreaded/PlatformDefinitions.h"
+#include "physics_effects/low_level/pfx_low_level_include.h"
+#include "../src/low_level/solver/pfx_parallel_group.h"
+
+using namespace sce::PhysicsEffects;
+
+
+class btPersistentManifold;
+struct btLowLevelData;
+
+class btLowLevelConstraintSolver2 : public btSequentialImpulseConstraintSolver
+{
+	
+protected:
+
+	btLowLevelData*		m_lowLevelData;
+
+public:
+
+	btLowLevelConstraintSolver2(btLowLevelData* lowLevelData);
+	
+	virtual ~btLowLevelConstraintSolver2();
+
+	virtual btScalar solveGroup(btCollisionObject** bodies,int numBodies,btPersistentManifold** manifold,int numManifolds,btTypedConstraint** constraints,int numConstraints,const btContactSolverInfo& info, btIDebugDraw* debugDrawer, btStackAlloc* stackAlloc,btDispatcher* dispatcher);
+
+};
+
+
+
+#endif //__BT_LOW_LEVEL_CONSTRAINT_SOLVER2_H