Add Debounce method for use in SpesialInput.

[IhorNehrutsa]

Thank you Matthias for the fast review. Comments are welcome.

[mathertel]

yes, this one was missing. Now code is duplicated in debounce(const int value) and tick(). You can call debounce() in tick() so it seems. Please add some documentation that tick() is debouncing by itself but tick(bool activeLevel) is not.

[mathertel]

This will be a major release as the interface is changing.

[IhorNehrutsa]

Backward compatibility is saved at that moment. Old code will work with

  void setDebounceTicks(const unsigned int ms); // obsolete
  void setClickTicks(const unsigned int ms); // obsolete
  void setPressTicks(const unsigned int ms); // obsolete

and future code will work with

  void setDebounceMs(const unsigned int ms);
  void setClickMs(const unsigned int ms);
  void setPressMs(const unsigned int ms);

Both

  void tick(void);
  void tick(bool level);

perform debouncing itself.