[Refactor] Abstract model index getter as IItemModelDispatcher
#2882
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What
Replaced the hardcoded check in
MetaItem#getModelIndex(ItemStack)with a call to a specificIItemComponentfrom the metaValueItem, makin it easier to add items with multiple models.Implementation Details
IItemModelDispatcherwas added as a child interface ofIItemComponent, with a single methodgetModelIndex(ItemStack, int)MetaValueItemto store the model dispatcher, pretty much the same as other special `IItemComponent`sMetaItem#getModelIndex(ItemStack)now callsMetaValueItem#getItemModelDispatcher()and thenIItemModelDispatcher#getModelIndex(ItemStack, int)IElectricItemandIntCircuitIngredientare moved to new impl.