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/0076-ExperienceOrbMergeEvent.patch

@@ -1,4 +1,4 @@
-From 8ff1280282b3c67e3fb94958a9a9c4f4d6410faa Mon Sep 17 00:00:00 2001
+From 6aa6f1d8373362d2388f8fd7268c9c69f579ee49 Mon Sep 17 00:00:00 2001
 From: Aikar <aikar@aikar.co>
 Date: Tue, 19 Dec 2017 22:56:24 -0500
 Subject: [PATCH] ExperienceOrbMergeEvent
@@ -101,5 +101,5 @@ index 000000000..0ce3e3977
 +    }
 +}
 -- 
-2.25.1
+2.26.2