Add ACME EnergyMeter
Created by: derkling
While reviewing #121 I ended up collecting so many mods which at the end the code has completely changed. This is the new version of the ACME EnergyMeter I would be (reasonably) happy to get merged. Main updates are:
- More abstract configuration interface which allows also to give a custom name to each channel
- Run-time check for required dependencies (i.e. iio-capture)
- More robust code to stop eventually already running iio-capture instances
- Using "standard" energy.json file to report just the energy of each measured channel
- Renaming and cosmetics to match the rest of the file
By merging this PR we can close both #121 and #72