Add Throw EntityChangeBlockEvent for BrushableBlockEntity#brush

[Y2Kwastaken]

This Pull Request adds calls for EntityChangeBlockEvent for BrushableBlockEntities. This allows for the increased tracking described in #12132.

This warrants further testing due to the fact that the point where the loot table is unpacked at could cause issues, however, I was unable to notice anything significant during my testing. Input for this aspect is appreciated.

[lynxplay]

The event calls are too late right now.
Right now, the block would drop its content even if people cancelled the change event.
It would also unpack its loottable, which, that modifies the block.

We need to move the unpacking down, dropContent calls it so, I think we can just move it right before the block set when a completion state changed (needs testing).
But yea, cancelling these events should maintain the block in the same state (not drop items/unpack loot tables).

[Y2Kwastaken]

It would also unpack its loottable, which, that modifies the block.

Ran into this now the loot should only be unpacked after the first permitted brush Cancelling the event should not persist the state.

We need to move the unpacking down, dropContent calls

I moved these down as well and it seems to be working as intended to me.

I did some more playing around with the event and wasn't able to change the state after cancelling as intended using the vanilla brushing behavior. The patch needs a bit of cleaning up, but I'll leave it as is for now to see if this is what we will go with before I do that.

[lynxplay]

Mhmmm, I did not even think about the brushCount, good catch.
This makes this entire block a lot more difficult, but yea, I think this is the way to go forward (shuffling).
The client should be perfectly fine and we still unpack the loottable on the first brush (the first brush count moves from 0 to 1 in completion stage)

Event is still not fully cancelling the "last" and final brush tho, the game event is still called and the brushCount is not reset either.

[lynxplay]

769de10 might be a separate solution, not gonna push over yet because I am too tired.
Will review tomorrow.