feature(powerspy): implements the PowerSpy API.

feature(cli): implements a simple CLI for printing the power consumption in the console.

feature(executable): use sbt-native-launcher to provide a simple way for creating a launcher.
Merge pull request #1 from Spirals-Team/feature/powerspy

PowerSpy feature
chore(log): change the logging level

Change the logging level of tests to OFF
Merge pull request #2 from Spirals-Team/develop

Develop the PowerSpy's scala library