`ProcessMeasurment` and related class should name input arguments more informatively

The ProcessMeasurement, ProcessSensingMeasurement, etc. classes expect certain measurement objects as input. However, the input arguments are just generically named meas_obj_1, meas_obj_2, etc. These names should be changed to be more reflective of the actual measurement objects that are expected.

Also I would leave out the _obj, since everything in python is an object in some sense.