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/Entities/EntityEffect.cpp

@@ -410,10 +410,10 @@ void cEntityEffectHunger::OnTick(cPawn & a_Target)
 
 void cEntityEffectInvisibility::BroadcastMetadata(cPawn & a_Target)
 {
-	auto ParentChunk = a_Target.GetParentChunk();
-	if (ParentChunk != nullptr)
+	auto World = a_Target.GetWorld();
+	if (World != nullptr)
 	{
-		ParentChunk->BroadcastEntityMetadata(a_Target);
+		World->BroadcastEntityMetadata(a_Target);
 	}
 }