v1.4.0

Additions:

Changes:

Removed the offhand container, and the config for an extra offhand item slot. Caused far too many bugs and issues for the novelty of having a single extra slot appear. A separate GUI for adding an item into the offhand slot will be added soon.

Fixes:

Many inventory issues have been fixed because of the removal of the offhand container! In fact, all fixes listed here but the last one are completely fixed because of the absence of the offhand container.
Fixed GUI deadlock due to Backhand's handling of mismatching its container to other GUIs
Fixed crash with DBC when opening the extra inventory
Fixed furnace fuel disappearing sometimes when holding an item in the offhand
Fixed index out of range crash with inventory tweaks
Fixed dragged items disappearing in creative mode when the survival tab is clicked
Fixed offhand item not updating when the player changes dimensions.

Backhand