Remove "Implement-Chunk-Priority-Urgency-System-for-Chunks" (Fixes #5980)

Mojang made some changes to priorities in 1.17 and it seems that these changes
conflict with the changes made in this patch, which in some cases appears to
cause excessive rescheduling of tasks.

This, however, is not confirmed as such but seems to be the behavior that we're
seeing to cause this issue, if mojang has adopted the changes we suggested,
then a good chunk of this patch may be unneeded, but, this needs a much better
look than I'm currently able to do

patches/server/0560-More-lightning-API.patch

@@ -0,0 +1,38 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: kennytv <jahnke.nassim@gmail.com>
+Date: Sun, 26 Jul 2020 14:44:09 +0200
+Subject: [PATCH] More lightning API
+
+
+diff --git a/src/main/java/org/bukkit/craftbukkit/entity/CraftLightningStrike.java b/src/main/java/org/bukkit/craftbukkit/entity/CraftLightningStrike.java
+index f7991ff14ef9cda0327b8621bf615b49cffd7ac5..db6b158f18ad7b9171a8c041802e3495d733bc16 100644
+--- a/src/main/java/org/bukkit/craftbukkit/entity/CraftLightningStrike.java
++++ b/src/main/java/org/bukkit/craftbukkit/entity/CraftLightningStrike.java
+@@ -45,4 +45,27 @@ public class CraftLightningStrike extends CraftEntity implements LightningStrike
+         return this.spigot;
+     }
+     // Spigot end
++
++    // Paper start
++    @Override
++    public int getFlashCount() {
++        return getHandle().flashes;
++    }
++
++    @Override
++    public void setFlashCount(int flashes) {
++        com.google.common.base.Preconditions.checkArgument(flashes >= 0, "Flashes has to be a positive number!");
++        getHandle().flashes = flashes;
++    }
++
++    @Override
++    public int getLifeTicks() {
++        return getHandle().life;
++    }
++
++    @Override
++    public void setLifeTicks(int lifeTicks) {
++        getHandle().life = lifeTicks;
++    }
++    // Paper end
+ }