InfoButton: default iconFill to black, make clients specify custom colors, https://github.com/phetsims/scenery-phet/issues/363
InfoButton: default iconFill to black, make clients specify custom colors, https://github.com/phetsims/scenery-phet/issues/363

phetsims/scenery-phet,phetsims/scenery-phet,phetsims/scenery-phet