Ensure portal search radius is used when teleporting players (#2877)

Also add the create search radius mojang recently introduced
to config

Spigot-Server-Patches/Cache-user-authenticator-threads.patch

@@ -5,7 +5,7 @@ Subject: [PATCH] Cache user authenticator threads
 
 
 diff --git a/src/main/java/net/minecraft/server/EntityPlayer.java b/src/main/java/net/minecraft/server/EntityPlayer.java
-index 12156b6e5..47978174e 100644
+index 52ffdffa0..f40eab51f 100644
 --- a/src/main/java/net/minecraft/server/EntityPlayer.java
 +++ b/src/main/java/net/minecraft/server/EntityPlayer.java
 @@ -0,0 +0,0 @@ import com.google.common.collect.Lists;