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/0542-Player-elytra-boost-API.patch

@@ -1,31 +0,0 @@
-From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
-From: Trigary <trigary0@gmail.com>
-Date: Tue, 14 Apr 2020 12:05:22 +0200
-Subject: [PATCH] Player elytra boost API
-
-
-diff --git a/src/main/java/org/bukkit/craftbukkit/entity/CraftPlayer.java b/src/main/java/org/bukkit/craftbukkit/entity/CraftPlayer.java
-index 7257c8fedb6937d925dea592a69fd56ddd05c50d..2b24575e19cd1b24c259711bfd4e6cae6492f927 100644
---- a/src/main/java/org/bukkit/craftbukkit/entity/CraftPlayer.java
-+++ b/src/main/java/org/bukkit/craftbukkit/entity/CraftPlayer.java
-@@ -539,6 +539,20 @@ public class CraftPlayer extends CraftHumanEntity implements Player {
-         }
-         throw new RuntimeException("Unknown settings type");
-     }
-+
-+    @Override
-+    public org.bukkit.entity.Firework boostElytra(ItemStack firework) {
-+        Validate.isTrue(isGliding(), "Player must be gliding");
-+        Validate.isTrue(firework != null, "firework == null");
-+        Validate.isTrue(firework.getType() == Material.FIREWORK_ROCKET, "Firework must be Material.FIREWORK_ROCKET");
-+
-+        net.minecraft.world.item.ItemStack item = org.bukkit.craftbukkit.inventory.CraftItemStack.asNMSCopy(firework);
-+        net.minecraft.world.level.Level world = ((CraftWorld) getWorld()).getHandle();
-+        net.minecraft.world.entity.projectile.FireworkRocketEntity entity = new net.minecraft.world.entity.projectile.FireworkRocketEntity(world, item, getHandle());
-+        return world.addFreshEntity(entity)
-+            ? (org.bukkit.entity.Firework) entity.getBukkitEntity()
-+            : null;
-+    }
-     // Paper end
- 
-     @Override