code: @NonNull
      public IconicsDrawable icon(@NonNull IIcon icon) {
          mIcon = icon;
          mPlainIcon = null;
          ITypeface typeface = icon.getTypeface();
          mIconBrush.getPaint().setTypeface(typeface.getTypeface(mContext));
  
          invalidateSelf();
          return this;
      }
docs: Loads and draws given.
  
  @return The current IconicsDrawable for chaining.