Add option to hide REntities

SpigotCore_Main/src/de/steamwar/entity/REntity.java

@@ -59,6 +59,8 @@ public class REntity {
     private byte pitch;
     private byte headYaw;
 
+    @Getter
+    private boolean hidden;
     @Getter
     private boolean invisible;
     @Getter
@@ -104,6 +106,19 @@ public class REntity {
         this.objectData = objectData;
     }
 
+    public void hide(boolean hide) {
+        if(hidden == hide)
+            return;
+
+        if(hide) {
+            despawn(packet -> server.updateEntity(this, packet));
+            hidden = true;
+        } else {
+            hidden = false;
+            spawn(packet -> server.updateEntity(this, packet));
+        }
+    }
+
     public void move(Location location) {
         move(location.getX(), location.getY(), location.getZ(), location.getPitch(), location.getYaw(), rotToByte(location.getYaw()));
     }

SpigotCore_Main/src/de/steamwar/entity/REntityServer.java

@@ -138,6 +138,7 @@ public class REntityServer implements Listener {
         if(fromId == toId)
             return;
 
+        if(!entity.isHidden())
             onMissing(players.get(fromId), players.get(toId), entity::despawn);
         removeEntityFromChunk(entity);
     }
@@ -149,10 +150,14 @@ public class REntityServer implements Listener {
             return;
 
         addEntityToChunk(entity);
+        if(!entity.isHidden())
             onMissing(players.get(toId), players.get(fromId), entity::spawn);
     }
 
     void updateEntity(REntity entity, Object packet) {
+        if(entity.isHidden())
+            return;
+
         for(Player player : players.getOrDefault(entityToId(entity), emptyPlayers)) {
             TinyProtocol.instance.sendPacket(player, packet);
         }
@@ -260,6 +265,7 @@ public class REntityServer implements Listener {
         long id = chunkToId(x, z);
         players.computeIfAbsent(id, i -> new HashSet<>()).add(player);
         for(REntity entity : entities.getOrDefault(id, emptyEntities)) {
+            if(!entity.isHidden())
                 entity.spawn(packet -> TinyProtocol.instance.sendPacket(player, packet));
         }
     }
@@ -273,6 +279,7 @@ public class REntityServer implements Listener {
             players.remove(id);
 
         for(REntity entity : entities.getOrDefault(id, emptyEntities)) {
+            if(!entity.isHidden())
                 entity.despawn(packet -> TinyProtocol.instance.sendPacket(player, packet));
         }
     }