Revert "Optimize Pathfinding"

This patch appears to be causing some issues with 1.14.3 entity AI

Spigot-Server-Patches/Fix-client-rendering-skulls-from-same-user.patch

@@ -12,7 +12,7 @@ This allows the client to render multiple skull textures from the same user,
 for when different skins were used when skull was made.
 
 diff --git a/src/main/java/net/minecraft/server/ItemStack.java b/src/main/java/net/minecraft/server/ItemStack.java
-index 2acd02f2f4..ca1bd02995 100644
+index 90c7182554..b9c5af51f5 100644
 --- a/src/main/java/net/minecraft/server/ItemStack.java
 +++ b/src/main/java/net/minecraft/server/ItemStack.java
 @@ -0,0 +0,0 @@ public final class ItemStack {