Improvements to Logging Warnings/Dupe Entities - Resolves #1544

1) Removed "Regen" mode of Dupe UUID resolver, forced safe.
Some servers who updated before we had safe mode added still had this value.

There's really no reason to keep this mode, as we've seen that vanilla
triggers this often and 99.9999999% of cases will be an actual duplicate
that needs to be deleted.

2) Made Vanilla Debug messages about dupe UUIDs and dupe uuid resolve messages
only show up if the debug.entities flag is on. This will stop server owners
from panicing from seeing these logs, and stop opening bug reports on this,
only for us to tell you "don't worry about it".

3) Avoid adding entities to world that are already added to world.

This can be triggered by anything that causes an entity to be added
to the world during the chunk load process, such as chunk conversions.

Issue #1544 was a case of this.

4) Removed debug warning about ExpiringMap.

Nothing more I know to do about this anyways. We recover from it,
stop warning to reduce noise of issues to us.

Spigot-Server-Patches/0347-Implement-Force-Loaded-Chunk-API.patch

@@ -1,14 +1,14 @@
-From 7d73bd83af6d5ec654addd52aff5bd878c96342f Mon Sep 17 00:00:00 2001
+From 26e5f4a9dead4dec758399f9f3ad765c6cbc4a96 Mon Sep 17 00:00:00 2001
 From: willies952002 <admin@domnian.com>
 Date: Wed, 29 Aug 2018 00:37:42 -0400
 Subject: [PATCH] Implement Force-Loaded Chunk API
 
 
 diff --git a/src/main/java/net/minecraft/server/World.java b/src/main/java/net/minecraft/server/World.java
-index 650e605b5b..2ff8536d59 100644
+index 2016051ef5..bcbc78bd8f 100644
 --- a/src/main/java/net/minecraft/server/World.java
 +++ b/src/main/java/net/minecraft/server/World.java
-@@ -3023,6 +3023,7 @@ public abstract class World implements IEntityAccess, GeneratorAccess, IIBlockAc
+@@ -3024,6 +3024,7 @@ public abstract class World implements IEntityAccess, GeneratorAccess, IIBlockAc
          return forcedchunk != null && forcedchunk.a().contains(ChunkCoordIntPair.a(i, j));
      }