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:
b999860d SPIGOT-2304: Add LootGenerateEvent

CraftBukkit Changes:
77fd87e4 SPIGOT-2304: Implement LootGenerateEvent
a1a705ee SPIGOT-5566: Doused campfires & fires should call EntityChangeBlockEvent
41712edd SPIGOT-5707: PersistentDataHolder not Persistent on API dropped Item

Spigot-API-Patches/0028-Entity-AddTo-RemoveFrom-World-Events.patch

@@ -1,4 +1,4 @@
-From 7a1354a251ad7d78f0a7f56d94d051e30fcc9a9a Mon Sep 17 00:00:00 2001
+From 2c51cf61112a37b8ac0e8d50d54f097b0ad72924 Mon Sep 17 00:00:00 2001
 From: Aikar <aikar@aikar.co>
 Date: Mon, 28 Mar 2016 20:26:34 -0400
 Subject: [PATCH] Entity AddTo/RemoveFrom World Events
@@ -78,5 +78,5 @@ index 000000000..e5dbbd660
 +    }
 +}
 -- 
-2.25.1
+2.26.2