ref #6 -refactoring

- added interp1
- added peak finder
- added bpm estimation
- added findbestaxis

android/ConductorsWatch/app/src/main/java/de/tonifetzer/conductorswatch/BpmEstimator.java

@@ -34,6 +34,8 @@ public class BpmEstimator implements SensorEventListener {
 
             if(mAccelerometerWindowBuffer.isNextWindowReady()){
 
+                //TODO: calculate average samplerate using the window - interpolation of sensordata would be better i think
+
                 //int randomNum = ThreadLocalRandom.current().nextInt(0, 240 + 1);
                 long diff = mAccelerometerWindowBuffer.getYongest().ts - mAccelerometerWindowBuffer.getOldest().ts;