code: public IconProviderBuilder forShape(String shapeName, String iconName)
  	{
  		setType(Type.MODEL);
  		shapeIcons.put(shapeName, icon(iconName));
  		return this;
  	}
docs: Sets the icon to use for a specific shape/group in a {@link MalisisModel}.
  
  @param shapeName the shape name
  @param iconName the icon name
  @return the icon provider builder