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-Server-Patches/0101-Optimize-UserCache-Thread-Safe.patch

@@ -1,4 +1,4 @@
-From 42a7de04cb2af799968c585b59635d5e9814a12f Mon Sep 17 00:00:00 2001
+From ec8f872ec6d8766f5f5c088ba89d7906a3f7bbd6 Mon Sep 17 00:00:00 2001
 From: Aikar <aikar@aikar.co>
 Date: Mon, 16 May 2016 20:47:41 -0400
 Subject: [PATCH] Optimize UserCache / Thread Safe
@@ -10,7 +10,7 @@ Additionally, move Saving of the User cache to be done async, incase
 the user never changed the default setting for Spigot's save on stop only.
 
 diff --git a/src/main/java/net/minecraft/server/MinecraftServer.java b/src/main/java/net/minecraft/server/MinecraftServer.java
-index f45c658770..bdc98d12c6 100644
+index a5aa6553cc..35d31a9c36 100644
 --- a/src/main/java/net/minecraft/server/MinecraftServer.java
 +++ b/src/main/java/net/minecraft/server/MinecraftServer.java
 @@ -760,7 +760,7 @@ public abstract class MinecraftServer extends IAsyncTaskHandlerReentrant<TickTas
@@ -98,5 +98,5 @@ index 65659996c3..d32bec70d0 100644
      }
  
 -- 
-2.25.1
+2.26.2