Change interfaces

Remove unneeded cpp files of pure virtual interfaces (no implementation)
:
 -GenericControl
 -GenericMotor
 -GenericSensor
 
 New commands for K factors in GenericControl
 Methods for getTime and getVelocity i GenericSensor
Implementation of a simple PID control for takeoff during calibration

New commands in serial interface for modifying the K factors
Motor power is a double not a int
AccGyroData computes the intgrated values
Use SimpleControl for altitude during calibration

Add sAltitude in Constants
Use it in CalibrationLoop + getTime from virtual sensor instead of using
millis (non sense for simulation). Real sensor class should just return
millis().
Set the K values in the simulation