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:
18cda936 Fix variant of unloadChunkRequest that was incorrectly never deprecated
00763e1b Deprecate some methods
35a83d54 SPIGOT-4572: Make default no permission message clearer
6163343d Fix some misplaced material enum entries
8736469c Fix typo in TechnicalPiston documentation

CraftBukkit Changes:
0c715b32 SPIGOT-4579: Shulker boxes not dropping in creative
50fbc3f1 SPIGOT-4576: Fix attributes in itemstack internal data being lost
8059a937 SPIGOT-4577: Fix loss of int/double custom tags when serialized to yaml
07e504c3 Clarify exception thrown when setting drop chance for player inventory
98b862ad Fix duplicate iron golem add
843cee65 Fix a bunch of duplicate EntityCombustEvent calls
43855624 SPIGOT-4571: EntityCombustEvent not firing for phantoms

Spigot-API-Patches/getPlayerUniqueId-API.patch

@@ -9,7 +9,7 @@ In Offline Mode, will return an Offline UUID
 This is a more performant way to obtain a UUID for a name than loading an OfflinePlayer
 
 diff --git a/src/main/java/org/bukkit/Bukkit.java b/src/main/java/org/bukkit/Bukkit.java
-index 02e7d118..233a7154 100644
+index bc04472e..bd246827 100644
 --- a/src/main/java/org/bukkit/Bukkit.java
 +++ b/src/main/java/org/bukkit/Bukkit.java
 @@ -0,0 +0,0 @@ public final class Bukkit {
@@ -34,7 +34,7 @@ index 02e7d118..233a7154 100644
       * Gets the plugin manager for interfacing with plugins.
       *
 diff --git a/src/main/java/org/bukkit/Server.java b/src/main/java/org/bukkit/Server.java
-index 9e7bc162..b8076fc3 100644
+index 9f3ffb16..5eb1d371 100644
 --- a/src/main/java/org/bukkit/Server.java
 +++ b/src/main/java/org/bukkit/Server.java
 @@ -0,0 +0,0 @@ public interface Server extends PluginMessageRecipient {