shrink down cube size of BasicDemo 10 times (it looked ginormous in VR) from 2x2x2 meter to 0.2

add test for VR HUD/sub-titles
fix issue in previous commit, partial string use %.8s not %8.s
use long long int in b3Clock
fix warning/error in pointer alignment in serialization
Fix pybullet Windows compilation.
(thanks to bkeys/https://github.com/bulletphysics/bullet3/pull/687)

examples/StandaloneMain/main_opengl_single_example.cpp

@@ -17,14 +17,9 @@ subject to the following restrictions:
 
 #include "../CommonInterfaces/CommonExampleInterface.h"
 #include "../CommonInterfaces/CommonGUIHelperInterface.h"
-#include "BulletCollision/CollisionDispatch/btCollisionObject.h"
-#include "BulletCollision/CollisionShapes/btCollisionShape.h"
-#include "BulletDynamics/Dynamics/btDiscreteDynamicsWorld.h"
+#include "../Utils/b3Clock.h"
 
 
-#include "LinearMath/btTransform.h"
-#include "LinearMath/btHashMap.h"
-
 
 
 #include "../OpenGLWindow/SimpleOpenGL3App.h"
@@ -74,7 +69,7 @@ public:
 };
 int main(int argc, char* argv[])
 {
-
+	
 	SimpleOpenGL3App* app = new SimpleOpenGL3App("Bullet Standalone Example",1024,768,true);
 	
 	prevMouseButtonCallback = app->m_window->getMouseButtonCallback();
@@ -93,13 +88,17 @@ int main(int argc, char* argv[])
 	example->initPhysics();
 	example->resetCamera();
 	
+	b3Clock clock;
+
 	do
 	{
 		app->m_instancingRenderer->init();
         app->m_instancingRenderer->updateCamera(app->getUpAxis());
 
-		example->stepSimulation(1./60.);
-	  	
+		btScalar dtSec = btScalar(clock.getTimeInSeconds());
+		example->stepSimulation(dtSec);
+	  	clock.reset();
+
 		example->renderScene();
  	
 		DrawGridData dg;