Floating boxes with plain packager

[khorchanov]

Floating boxes with plain packager :

    private static List<StackableItem> products = Arrays.asList(
            new StackableItem(Box.newBuilder().withDescription("1").withSize(395, 260, 185).withWeight(7).build(), 20),
            new StackableItem(Box.newBuilder().withDescription("2").withSize(530, 255, 150).withWeight(5).build(), 1)
    );

    private static Container container = Container.newBuilder().withDescription("1")
            .withEmptyWeight(0)
            .withSize(1200, 1200, 500)
            .withMaxLoadWeight(10000)
            .build();

     var p_packager = PlainPackager.newBuilder().build();

[skjolber]

@khorchanov this is a known issue, and it is also desireable for some cases, like small web shop orders where empty space is just filled in.

But obiously this is not ideal for a lot of scenarios, so I've created a new issue: #554