add support for double precision and 64bit serialization (and compatibility between all versions)

fix some issue in serialization of nested array data
add some tesing files

src/BulletCollision/CollisionShapes/btTriangleMeshShape.h

@@ -20,6 +20,7 @@ subject to the following restrictions:
 #include "btStridingMeshInterface.h"
 
 
+
 ///The btTriangleMeshShape is an internal concave triangle mesh interface. Don't use this class directly, use btBvhTriangleMeshShape instead.
 class btTriangleMeshShape : public btConcaveShape
 {
@@ -90,14 +91,16 @@ public:
 
 struct	btTriangleMeshShapeData
 {
-	//btConcaveShapeData	m_concaveShapeData;
 	btCollisionShapeData	m_collisionShapeData;
 
 	btStridingMeshInterfaceData m_meshInterface;
 
-	btScalar	m_collisionMargin;
+	float	m_collisionMargin;
+
+	char m_padding[4];
 };
 
+
 SIMD_FORCE_INLINE	int	btTriangleMeshShape::calculateSerializeBufferSize()
 {
 	return sizeof(btTriangleMeshShapeData);