Remove player from destroy queue when they go visible. Fixes BUKKIT-2071

If a plugin calls player.hidePlayer(other); then player.showPlayer(other);
in the same tick the other player will be added to the entity destroy queue
then a spawn packet will be sent. On the next tick the queue will be
processed and a destroy packet will be sent that renders the other player
invisible. To correct this we ensure the destroy queue is in sync with use
of the vanish API.

By: Travis Watkins <amaranth@ubuntu.com>

paper-server/src/main/java/org/bukkit/craftbukkit/entity/CraftPlayer.java

@@ -631,6 +631,7 @@ public class CraftPlayer extends CraftHumanEntity implements Player {
         EntityTracker tracker = ((WorldServer) entity.world).tracker;
         EntityPlayer other = ((CraftPlayer) player).getHandle();
         EntityTrackerEntry entry = (EntityTrackerEntry) tracker.trackedEntities.get(other.id);
+        getHandle().g.remove(Integer.valueOf(other.id)); // Should be called destroyQueue
         if (entry != null && !entry.trackedPlayers.contains(getHandle())) {
             entry.updatePlayer(getHandle());
         }