FurnaceSorter 1.3.10

I've flipped the colours on the UI buttons to try and make it less confusing for players. When the sorter is enabled, the button background colour will be green rather than red. This also applies to the AutoFuel button.
The AutoFuel toggle is also now enabled by default when you enable the sorter.

Fixed an issue which could cause some items to disappear when a furnace was almost full.

Fixed the NRE bug when using AutoFuel and no fuel was available in the players' inventory to transfer.

Added AutoWood/AutoFuel functionality (you can toggle this on via the GUI button).

Improved the splitting functionality so the remainder of items is now spread over all stacks rather than just the first.

- Completely rewritten sorting logic
- Improved item management and removed hardcoded values (this should fix horse meat not splitting)
- Better compatibility with non-default stack sizes (tested with max stack size of 1mil)

Made sorting logic (charocal/fuel/input/output counting) more reliable, and fixed support for newer fireplaces, campfires, and the cauldron.

Removed debug message.

Fixed charcoal in the furnace causing the items to split improperly.

- Reduced the number of stacks in the refinery from 4 to 3.

- Added additional permission checks