allow to use colors from MJCF file as option (default to random Google colors), use p.loadMJCF(filename, flags=p.URDF_MJCF_COLORS_FROM_FILE

fix quadruped.py example.
add PyBullet.isConnected() API, more friendly than PyBullet.getConnectionInfo()["connected"]

examples/ExampleBrowser/CollisionShape2TriangleMesh.cpp

@@ -139,7 +139,7 @@ void CollisionShape2TriangleMesh(btCollisionShape* collisionShape, const btTrans
 				btConvexShape* convex = (btConvexShape*)collisionShape;
 				{
 					btShapeHull* hull = new btShapeHull(convex);
-					hull->buildHull(0.0);
+					hull->buildHull(0.0, 1);
 
 					{
 						//int strideInBytes = 9*sizeof(float);