Renaming unused measurements to accurate names + removing superfluous apparent on power/energy

[ohshazbot]

• electricfield already exists in the ontology with the unit (V/m) and magnetic field strength measures (A/m).
• Apparent power and energy sensors use kilo_volt_ampere and kilo_volt_ampere_hours respectively so we don’t need the explicit apparent units
• joules_per_kilogram_kelvin is a measure of entropy.

[google-cla]

Thanks for your pull request! It looks like this may be your first contribution to a Google open source project. Before we can look at your pull request, you'll need to sign a Contributor License Agreement (CLA).

View this failed invocation of the CLA check for more information.

For the most up to date status, view the checks section at the bottom of the pull request.

[ohshazbot]

Hmm, I'll have to look into those validation failures