Significantly refactor so the code can support ownership on stackable items, however only enable only on single stack items by default - can be applied to individual stackable items through `ItemDefinition.supportsStackableOwnership` - transfers ownership between item stacks when merging stacks instead of averaging it - ownership is stored in whole number shares based on the amount of the item rather than percentage per stack - ownership will try to merge with existing ownership names + reasons before creating new ones - ownership panels above item description can show multiple panels if there are multiple owners