Added function template for attitude propagation
Added function template for attitude propagation

jeljaik/extended-kalman-filter,jeljaik/extended-kalman-filter,zmxu/extended-kalman-filter,jeljaik/extended-kalman-filter,zmxu/extended-kalman-filter,jeljaik/extended-kalman-filter,zmxu/extended-kalman-filter,zmxu/extended-kalman-filter,zmxu/extended-kalman-filter,jeljaik/extended-kalman-filter