Fixing Experience Grinding Problem

Mob Farms and Experience Farms have been good for a while now, but I have a suggestion.

We need to send the right message and suggest a tool for Mob Spawners to be not breakable [in survival], but a tool that can switch them between a regular spawner and a trial spawner. Whether that tool should be available in survival/adventure or not is up to you.

In terms of world generation, we can have old chunks leave generated mob spawners as it is (potentially breakable), but mob spawners that have just been generated should have some sort of key to swap between trials and regular mob spawners.