Updated Upstream (Bukkit/CraftBukkit)

Upstream has released updates that appears to apply and compile correctly.
This update has not been tested by PaperMC and as with ANY update, please do your own testing

Bukkit Changes:
e461dcfe #555: Item - add getters/setters for owner/thrower

CraftBukkit Changes:
055870c4 #758: Item - add getters/setters for owner/thrower

Spigot-API-Patches/Item-canEntityPickup.patch

@@ -9,9 +9,9 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 --- a/src/main/java/org/bukkit/entity/Item.java
 +++ b/src/main/java/org/bukkit/entity/Item.java
 @@ -0,0 +0,0 @@ public interface Item extends Entity {
-      * @param delay New delay
       */
-     public void setPickupDelay(int delay);
+     @Nullable
+     public UUID getThrower();
 +
 +    // Paper Start
 +    /**