Inventory shift API

[Bloeckchengrafik]

Something we've noticed is the following: Implementing shift-click into the block inventories is a large hassle we'd like to avoid to re-implement in all menus. The main pain-point is Shift-click filtering:
When shift-clicking into a slot, there is no way of knowing where the item ends up and to re-route it or just block some slots. To do that, large parts of the inventory code need to be overridden with new behaviour, even though this is generally a often-desired feature in both vanilla inventories and custom menus that interact with items, such as machines.

Also, the rules for shift-clicking and normal item deposition differ sometimes, for example on the input field of the furnace. You may not shift-click fuels into the input slot, but you can put it in using a normal click.

Our solution for this is rule-based, see the implementation and docs for more details. Here's the proposition text:

Variant 2 is some sort of SlotRule that can be attached to a slot in an inventory. This rule declares interaction with > the slot, might it be just normal item deposition, shift-click interaction and more. This could also have advantages > for custom chest menus due to defining a local api for processing clicks without relying on a filtered event or similar. Drawback is that this not as easily composable as the event-based solution and that it would be quite the large change encompassing more than this feature request (feels like scope creep).