This is a simple mod that allows you to configure any item to act as a spawn egg in a dispenser.
Additionally you can have the entity spawn with NBT data if you place some under the "EntityTag" property in the item NBT.
This mod is mostly meant for modpack authors wanting to implement special behavior for items in droppers.
You can configure this in the itemspawner-config.toml file.
The format is as follows: ["item_id->mob_id","item_id->mob_id"]
So an example would be: ["minecraft:iron_ingot->minecraft:iron_golem"]
