Broadcast refactor (#4264)

* Move Broadcast functions from cChunkMap to cBroadcaster

- Remove cBroadcastInterface in favour of cBroadcaster.

- cChunk: Remove broadcast functions.

* resurect broadcast interface

* Absorb cBroadcaster into cWorld.
Removes the need for forwarding the function calls.

* Improve const-correctness

* Use Int8 instead of char

+ Comment `ForClients` functions

* Improve comments

* Broadcaster: Rename ForClients functions

src/BlockEntities/MobSpawnerEntity.cpp

@@ -178,11 +178,9 @@ void cMobSpawnerEntity::SpawnEntity(void)
 					if (Chunk->GetWorld()->SpawnMobFinalize(std::move(Monster)) != cEntity::INVALID_ID)
 					{
 						HaveSpawnedEntity = true;
-						Chunk->BroadcastSoundParticleEffect(
+						m_World->BroadcastSoundParticleEffect(
 							EffectID::PARTICLE_MOBSPAWN,
-							static_cast<int>(PosX * 8.0),
-							static_cast<int>(RelY * 8.0),
-							static_cast<int>(PosZ * 8.0),
+							Vector3d(PosX, RelY, PosZ).Floor(),
 							0
 						);
 						NearbyEntities++;