remove Extras/obsolete/quickstep

improve serialization based on feedback: make it easier to serialize a single object, or single shape, or single bvh.
Modified Bullet/Demos/ConcaveDemo to use btSerializer to serialize the btOptimizedBvh (or optionally the trimesh+bvh)

You can also serialize trimesh without BVH, use:
serializer->setSerializationFlags(BT_SERIALIZE_NO_BVH);//	or BT_SERIALIZE_NO_TRIANGLEINFOMAP

src/BulletDynamics/Dynamics/btRigidBody.cpp

@@ -19,6 +19,7 @@ subject to the following restrictions:
 #include "LinearMath/btTransformUtil.h"
 #include "LinearMath/btMotionState.h"
 #include "BulletDynamics/ConstraintSolver/btTypedConstraint.h"
+#include "LinearMath/btSerializer.h"
 
 //'temporarily' global variables
 btScalar	gDeactivationTime = btScalar(2.);
@@ -388,3 +389,12 @@ const char*	btRigidBody::serialize(void* dataBuffer, class btSerializer* seriali
 }
 
 
+
+void btRigidBody::serializeSingleObject(class btSerializer* serializer) const
+{
+	btChunk* chunk = serializer->allocate(calculateSerializeBufferSize(),1);
+	const char* structType = serialize(chunk->m_oldPtr, serializer);
+	serializer->finalizeChunk(chunk,structType,BT_RIGIDBODY_CODE,(void*)this);
+}
+
+

src/BulletDynamics/Dynamics/btRigidBody.h

@@ -606,6 +606,8 @@ public:
 	///fills the dataBuffer and returns the struct name (and 0 on failure)
 	virtual	const char*	serialize(void* dataBuffer,  class btSerializer* serializer) const;
 
+	virtual void serializeSingleObject(class btSerializer* serializer) const;
+
 };
 
 //@todo add m_optionalMotionState and m_constraintRefs to btRigidBodyData