Fix placement of chunk tracking - Fixes #1199

Spigot had code that returned early in chunk add/remove methods.

This was causing our code added to set current chunks and counts to
be skipped over if the entity was default not persistent but made persistent.

This was the source of many issues

Fixes #1208

Spigot-Server-Patches/InventoryCloseEvent-Reason-API.patch

@@ -7,7 +7,7 @@ Allows you to determine why an inventory was closed, enabling plugin developers
 to "confirm" things based on if it was player triggered close or not.
 
 diff --git a/src/main/java/net/minecraft/server/Chunk.java b/src/main/java/net/minecraft/server/Chunk.java
-index 8c96e7318..3e80825f7 100644
+index 51e7a4ad8..81bf60efa 100644
 --- a/src/main/java/net/minecraft/server/Chunk.java
 +++ b/src/main/java/net/minecraft/server/Chunk.java
 @@ -0,0 +0,0 @@ public class Chunk {