A utility library to add a container type that can increase the max stack value of the items it stores. Still very much a work in progress.
The new container type is called StackMultiplierContainer and is pretty much the same as a SimpleItemContainer although it has a stack multiplier value that is multiplied with an item's vanilla max stack size in order to determine how many items each stack in this chest can contain.
Currently this isn't being used with any actual chests or block containers but is used with the backpack via the companion mod BiggerStacksBackpacks