Muon Kicker: Display Status of Kicker PSU

As a muon scientist, I need to see the current status of the Kicker PSU, so that I can monitor its behaviour.

#### Acceptance Criteria
1. I can view whether the Kicker PSU is currently switched ON or OFF
1. I can view the voltage readback of the Kicker PSU (measured in kV).
1. I can view the current readback of the Kicker PSU (measured in mA).

#### Notes
1. required by #3071
1. The Kicker PSU is controlled by a National Instruments DAQ device (DAQ-Mx).
1. See [Kicker_Separator_Schematics](http://www.facilities.rl.ac.uk/isis/computing/ICPdiscussions/Muon%20FE/MuonFE_Kicker_Separator%20v4.pptx).
1. The ON/OFF status of the Kicker PSU is read from a PLC.
1. The PLC is a Schneider Electric M580 device
1. The Kicker PSU voltage & current can only be read from the DAQ-Mx. At the present time, they cannot be set (hardware limitation).
1. **Note:** IBEX does not communicate directly with the Kicker PSU. It communicates with the NI DAQ-Mx. In order to read or set the voltage and/or current on the PSU, there needs to be some sort of calibration or lookup between the NI DAQ-Mx and the PSU.
* The calibration (scaling) relationship is:
* Kicker Voltage: 0-10V (DAQ) = 0-45kV (PSU)
* Kicker Current: 0-10V (DAQ) = 0-15mA (PSU)