main.cpp:
-Bug Fix: Handle return code of connecttofs routine. If it is not successful the track is considered as finished. This avoids freezing the tonuino.
-Feature: Voltage Measurement averages over multiple analog reads, which is smoothing the voltage value
-Feature: When pressing the previous button during audio play and the current track is already played for more than 2s, the current track is started again instead of the previous track