This build just formalizes some of the items that were in 2.1, like custom chickens with nametags having their own set of items and the ability to have chickens drop entities instead of just materials. Using the latest spigot API build for 1.16.5
Refactored the listener to use a new api method that is more accurate for determining if the egg dropper is a chicken, which allows us to determine if the chicken has a nametag.
Added "custom" section to the config.yml for named chickens, that allow them to override biome conditions.
preface a replacement item with "e_" and an entity type, to make the chicken spawn an entity and not a material!