Implement PortalLogic's TeleportBehavior

[whimxiqal]

Teleporting through portals in vanilla places the entity in the same relative location of the destination portal as the entry point of the origin portal. This logic was not preserved when using PortalLogic because the nearest-block connection point to the destination portal was used as the entity destination. This way, using a PortalLogic for nether portals now makes teleporting through nether portals much more smooth.

Awaiting API approval: SpongePowered/SpongeAPI#2614

To test, I ran it with a plugin with:

    @Listener
    public void onConstructPlugin(final ConstructPluginEvent event) {
        // Perform any one-time setup
        Sponge.eventManager().registerListener(EventListenerRegistration.builder(InvokePortalEvent.Prepare.class)
                .plugin(container)
                .order(Order.DEFAULT)
                .listener(e -> e.setPortalLogic(PortalLogic.builder().addPortal(
                        PortalLogic.factory().netherPortal().exitCalculator().get(),
                        PortalLogic.factory().netherPortal().finder().get(),
                        PortalLogic.factory().netherPortal().teleporter().get(),
                        PortalLogic.factory().netherPortal().generator().get()
                ).build()))
                .build());
    }

Before, teleporting was jerky and inconsistent, but now it feels like vanilla.