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/0075-PlayerPickupExperienceEvent.patch

@@ -1,4 +1,4 @@
-From 71071c945004982e39bd9f02ca5dd1183b1f37e0 Mon Sep 17 00:00:00 2001
+From 88833a36b967c46876edcd7c827f69d107b0441e Mon Sep 17 00:00:00 2001
 From: Aikar <aikar@aikar.co>
 Date: Tue, 19 Dec 2017 22:00:41 -0500
 Subject: [PATCH] PlayerPickupExperienceEvent
@@ -92,5 +92,5 @@ index 000000000..f7beb22d5
 +    }
 +}
 -- 
-2.25.1
+2.26.2