Add configuration for skipping hurting-projectile explosion when the entity is dead

[orang3i]

fixes issue #12487

Currently when a WitherSkull or a LargeFireBall hits a player and the player dies due to its damage the dropped loot is instantly destroyed by the explosion of the projectile.

This PR, delays the death drop by a tick and hence prevents the destruction of loot.

The configuration for this is set to be false by default .

[Owen1212055]

Cant this easily be done by a plugin?

[lynxplay]

Well, there is a confirmed mojira bug report out there for it which is why I marked the original issue as accepted.

However, this solution feels too ugly for me to consider it mergable, even behind a config options.
Delaying the drops by a tick is not something I am in favour of, this kind of extra state is screaming for problems.

[orang3i]

If no cleaner solution is suggested I will close this PR.

if anyone suggests a better approach, I definitely update the PR accordingly.

[orang3i]

I have updated the PR.

This solution seems much simpler, now the explosion doesn't happen if the entity is dead [not alive] instead of delaying the drop by a tick.