Re-enable light queue toggle, optimize neighbor checks, add max queue time

light queue is actually buggy, so re-enabling the config.

however, if anyone is ok with the buggy behavior, made the max time lost due to
light queue configurable.

We want to get to making the ligth queue default if we can make it work perfectly.

also applying neighbor optimizations to use the faster method for light checks.

Spigot-Server-Patches/0062-Chunk-save-queue-improvements.patch

@@ -1,4 +1,4 @@
-From 1f1de0e88a43b88331553bbd92b9dfedb6991c5a Mon Sep 17 00:00:00 2001
+From 6bc2658cdc074c1594d3b22de8c3f12bf7cda691 Mon Sep 17 00:00:00 2001
 From: Aikar <aikar@aikar.co>
 Date: Fri, 4 Mar 2016 18:18:37 -0600
 Subject: [PATCH] Chunk save queue improvements
@@ -26,10 +26,10 @@ Then finally, Sleeping will by default be removed, but due to known issues with
 But if sleeps are to remain enabled, we at least lower the sleep interval so it doesn't have as much negative impact.
 
 diff --git a/src/main/java/com/destroystokyo/paper/PaperConfig.java b/src/main/java/com/destroystokyo/paper/PaperConfig.java
-index 0d68ffd75a..fd00c320ce 100644
+index 12a56f6147..18296f1e1b 100644
 --- a/src/main/java/com/destroystokyo/paper/PaperConfig.java
 +++ b/src/main/java/com/destroystokyo/paper/PaperConfig.java
-@@ -208,4 +208,10 @@ public class PaperConfig {
+@@ -213,4 +213,10 @@ public class PaperConfig {
      private static void chunkLoadThreads() {
          minChunkLoadThreads = Math.min(6, getInt("settings.min-chunk-load-threads", 2)); // Keep people from doing stupid things with max of 6
      }
@@ -201,5 +201,5 @@ index a3aba244af..97917551a4 100644
  
          if (this.c.isEmpty()) {
 -- 
-2.18.0
+2.19.0