I've noticed that sensor values are being handled as integers by this function, which was causing poor performance of the PIDArduino logic and another logic plugin I am testing.  I have changed the type to float, and now logic controllers can receive more accurate temperature values.

- Method actor_power added to set the power without switching
- Method timer_remaining added to get the remaining time of a timer

Correct datatypes for def F automode to work

- Kettle Controller Fix
- Remove SQL Alchemie

Closes https://github.com/Manuel83/craftbeerpi3/issues/7