Revert previous change to clear chunk list on the end of each tick, make it configurable instead.

Whilst the new behaviour was technically correct as it prevented the possibility of the chunk tick list actually increasing over time, it introduced a few issues, namely the fact that it slowed growth to unreasonable levels, and interfered with the values which server admins have finally tuned, and come to enjoy over the last few years.
If it is absolutely essential that growth be halted and ticking reduced as much as possible, the config option is there for power users.
If we wish to 'fix' this by default in the future, a new chunk ticking algorithm, which actually has meaningful config options should be designed.

By: md_5 <git@md-5.net>

CraftBukkit-Patches/0031-Hopper-Cooldowns.patch

@@ -1,4 +1,4 @@
-From c9f04ca3489752262a5c59fa13385f09e331ce81 Mon Sep 17 00:00:00 2001
+From cde7f232212d25c0082bf180b7550ad7408e19a3 Mon Sep 17 00:00:00 2001
 From: erocs <github@erocs.org>
 Date: Sun, 8 Sep 2013 12:06:15 -0700
 Subject: [PATCH] Hopper Cooldowns
@@ -59,10 +59,10 @@ index 730eb78..a68b748 100644
                  }
  
 diff --git a/src/main/java/org/spigotmc/SpigotWorldConfig.java b/src/main/java/org/spigotmc/SpigotWorldConfig.java
-index 92497f5..fc0aa4c 100644
+index 43f7fd8..87eac1b 100644
 --- a/src/main/java/org/spigotmc/SpigotWorldConfig.java
 +++ b/src/main/java/org/spigotmc/SpigotWorldConfig.java
-@@ -160,4 +160,17 @@ public class SpigotWorldConfig
+@@ -164,4 +164,17 @@ public class SpigotWorldConfig
          maxTrackingRange = getInt( "entity-tracking-range.other", maxTrackingRange );
          log( "Entity Tracking Range: Pl " + playerTrackingRange + " / An " + animalTrackingRange + " / Mo " + monsterTrackingRange + " / Mi " + miscTrackingRange + " / Other " + maxTrackingRange );
      }