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

Extras/Serialize/BulletFileLoader/autogenerated/bullet_btConvexHullShapeData.h

@@ -33,9 +33,10 @@ namespace Bullet {
     {
     public:
         btConvexInternalShapeData m_convexInternalShapeData;
-        btVector3Data *m_unscaledPointsPtr;
+        btVector3FloatData *m_unscaledPointsFloatPtr;
+        btVector3DoubleData *m_unscaledPointsDoublePtr;
         int m_numUnscaledPoints;
-        char m_padding[4];
+        char m_padding3[4];
     };
 }