Method init

src/DigitalRainAnimation.hpp:209–214

  DigitalRainAnimation() {}

  void init(T* gfx, bool biggerText = false, bool alphabetOnly = false) {
    _gfx = gfx;
    isAlphabetOnly = alphabetOnly;
    setBigText(biggerText);
    prepareAnim();
  }

  void setup(int len_min, int len_max, int spd_min, int spd_max, int frame) {
    line_len_min = len_min;