provide with_outline_helper mixin to create outline paths for shapes
migrate hollowCircleBrush to use with_outline_helper mixin
migrate hollowSquareBrush to use with_outline_helper mixin
migrate horizontalLineBrush to use with_outline_helper mixin
migrate circularPatternBrush to use with_outline_helper mixin
oops, forgot to actually remove createOutline methods from these two modules
migrate sprayBrush to use with_outline_helper mixin
migrate verticalLineBrush to use with_outline_helper mixin
up version