re-enable shared memory connection for pybullet Gym envs (with fallback to GUI or DIRECT)

suppress shared memory connection warnings
add fallback from ER_BULLET_HARDWARE_OPENGL to TinyRenderer if not available

examples/pybullet/gym/pybullet_envs/examples/runServer.py

@@ -13,6 +13,7 @@ p.connect(p.GUI_SERVER)
 p.setAdditionalSearchPath(pybullet_data.getDataPath())
 
 while(1):
+	#this is a no-op command, to allow GUI updates on Mac OSX (main thread)
+	p.setPhysicsEngineParameter()
 	time.sleep(0.01)
-	p.getNumBodies()