add option to log joint torques (due to user applied torques and/or motor torques)

See quadruped.py for an example:
p.startStateLogging(p.STATE_LOGGING_GENERIC_ROBOT, "genericlogdata.bin", maxLogDof = 16, logFlags = p.STATE_LOG_JOINT_TORQUES)
Thanks to JulianYG, in pull request https://github.com/bulletphysics/bullet3/pull/1273

examples/SharedMemory/SharedMemoryPublic.h

@@ -607,6 +607,12 @@ enum eUrdfCollisionFlags
 	GEOM_FORCE_CONCAVE_TRIMESH=1,
 };
 
+enum eStateLoggingFlags
+{
+	STATE_LOG_JOINT_MOTOR_TORQUES=1,
+	STATE_LOG_JOINT_USER_TORQUES=2,
+	STATE_LOG_JOINT_TORQUES = STATE_LOG_JOINT_MOTOR_TORQUES+STATE_LOG_JOINT_USER_TORQUES,
+};