Massive renaming update in nms. If you bypassed Bukkit, you will likely break.

Also minimized all the nms diffs and generic cleanups all around.

src/main/java/net/minecraft/server/IInventory.java

@@ -6,7 +6,7 @@ public interface IInventory {
 
     ItemStack getItem(int i);
 
-    ItemStack a(int i, int j);
+    ItemStack splitStack(int i, int j);
 
     void setItem(int i, ItemStack itemstack);