Advanced Backpacks

Four backpacks: lighter inventory rows, an extra row, and slots for portal and ship materials. Vanilla-only recipes. Stand-alone, client-side.

Changelog

1.0.2

Fixed: swapping an item between the portal or ship slots and an occupied inventory slot could make it disappear. A swap that does not fit is now refused.
The backpack you wore when you logged out is put back on after logging in.

Fixed: with Better Archery the backpack's row was laid over the quiver row and items of the two got mixed up or lost. The backpack's row now goes above Better Archery's rows; they move down while a backpack is worn and back up when it comes off.
On death the backpack packs its row away before Better Archery puts the quiver into its own tombstone.
With the portal and ship slots open, Better Archery's quiver stays in its usual place under the inventory.
Workbench levels of the recipes are now 3 / 4 / 4 / 5 (there is no level 6 workbench).

First release.