[ENH] Fieldline opm plugin

[juangpc]

This plugin interacts with the Fieldline's Python api directly.
To do:

• build bridge with python methods.

• verify non-dependence on python environments.

• finish mock fieldline client.

• fix crash on shutting down.

• add different color to different sensor states. Two per state so that sensor blinks (not all states blink).

• report on compensation fields.

• rebuild whole gui on new init method.

• save config information in a file to load between runs. (and inits()).

• sensor renaming.

• solve crit issue being printed to terminal upon init the fieldline plugin. (not solved, it is a qt thing).

• Finish find ip reconfiguration.

todo later.

• finish get_chassis_list, get_fields, get_serial_numbers, get_chassis_serial_number, get_version
  get_sensor_state, get_calibration_value