I would suggest we should have some function to retrieve the amount of experience dropped from breaking a block.

In vanilla, the logic is hard coded in OreBlock, RedstoneOreBlock and MobSpawner, and they drop Exp orb themselves after the block is removed.

Think about this case: One modded block wants to know the amount of experience dropped from another modded block (the latter may not be even placed in the world).

I would recommend we should at least have:

1. A callback fired BEFORE the block removal is performed, which returns the amount of exp.
2. When a block breaks, drop that amount of exp if exp > 0. Do this in ServerPlayerInteractionManager instead of inside individual blocks.

Closed because this introduces a observable vanilla parity issue.