code: function styleColor(sq, color) {
    if (!sq.hasFormat('PRE')) {
      if (color === RESET_COLOR) {
        sq.changeFormat(null, {
          class: 'colour',
          tag: 'span'
        });
      } else {
        sq.setTextColour(color);
      }
    }
  }
docs: style color
  @param {SquireExt} sq - squire ext instance
  @param {string} color - color sting value
  @ignore