More improvements to activation range, improve turtles

improved the water code so that immunity wont trigger if the entity
has the water pathfinder system active, so this improves support
for all entities that know how to behave in water.

Merged 2 EAR patches together, and removed an MCUtil method that
doesnt have a purpose anymore

Spigot-Server-Patches/0263-ItemStack-getMaxItemUseDuration.patch

@@ -0,0 +1,40 @@
+From 1e12dab0780ccc1ca6e689cff0c54010aab97f66 Mon Sep 17 00:00:00 2001
+From: Aikar <aikar@aikar.co>
+Date: Tue, 5 Jun 2018 23:00:29 -0400
+Subject: [PATCH] ItemStack#getMaxItemUseDuration
+
+Allows you to determine how long it takes to use a usable/consumable item
+
+diff --git a/src/main/java/net/minecraft/server/ItemStack.java b/src/main/java/net/minecraft/server/ItemStack.java
+index f71d9ee578..a238388012 100644
+--- a/src/main/java/net/minecraft/server/ItemStack.java
++++ b/src/main/java/net/minecraft/server/ItemStack.java
+@@ -522,6 +522,7 @@ public final class ItemStack {
+         this.getItem().b(this, world, entityhuman);
+     }
+ 
++    public int getItemUseMaxDuration() { return k(); } // Paper - OBFHELPER
+     public int k() {
+         return this.getItem().c(this);
+     }
+diff --git a/src/main/java/org/bukkit/craftbukkit/inventory/CraftItemStack.java b/src/main/java/org/bukkit/craftbukkit/inventory/CraftItemStack.java
+index e7daa95078..d6e6b9bed4 100644
+--- a/src/main/java/org/bukkit/craftbukkit/inventory/CraftItemStack.java
++++ b/src/main/java/org/bukkit/craftbukkit/inventory/CraftItemStack.java
+@@ -183,6 +183,13 @@ public final class CraftItemStack extends ItemStack {
+         return (handle == null) ? Material.AIR.getMaxStackSize() : handle.getItem().getMaxStackSize();
+     }
+ 
++    // Paper start
++    @Override
++    public int getMaxItemUseDuration() {
++        return handle == null ? 0 : handle.getItemUseMaxDuration();
++    }
++    // Paper end
++
+     @Override
+     public void addUnsafeEnchantment(Enchantment ench, int level) {
+         Validate.notNull(ench, "Cannot add null enchantment");
+-- 
+2.19.0
+