Updated Upstream (CraftBukkit/Spigot) (#9598)

Upstream has released updates that appear to apply and compile correctly.
This update has not been tested by PaperMC and as with ANY update, please do your own testing

CraftBukkit Changes:
b76ceb4f5 PR-1235: Move EntityType return to base Entity class
e795d7490 SPIGOT-7458: Exception when Entity CommandSender executes Vanilla command
46c7fc3b1 SPIGOT-7452: Player#openSign cannot edit
d91e5aa0b SPIGOT-7447: Rewrite --forceUpgrade to minimise diff and properly handle CraftBukkit world layout
921ae06d6 Revert "SPIGOT-7447: Fix --forceUpgrade"

Spigot Changes:
94e187b5 Rebuild patches
3bce7935 SPIGOT-7091: Update bungeecord-chat

patches/server/0187-Add-openSign-method-to-HumanEntity.patch

@@ -4,18 +4,6 @@ Date: Sun, 1 Apr 2018 02:29:37 +0300
 Subject: [PATCH] Add openSign method to HumanEntity
 
 
-diff --git a/src/main/java/org/bukkit/craftbukkit/block/CraftSign.java b/src/main/java/org/bukkit/craftbukkit/block/CraftSign.java
-index a19504cf5c98b4d8070dc1ffe322b84e1896d84a..f1ba0fd5d17fb1a26cf09848d4125ecfab39eddb 100644
---- a/src/main/java/org/bukkit/craftbukkit/block/CraftSign.java
-+++ b/src/main/java/org/bukkit/craftbukkit/block/CraftSign.java
-@@ -134,6 +134,7 @@ public class CraftSign<T extends SignBlockEntity> extends CraftBlockEntityState<
-             return;
-         }
- 
-+        handle.setAllowedPlayerEditor(player.getUniqueId()); // Paper
-         ((CraftPlayer) player).getHandle().openTextEdit(handle, Side.FRONT == side);
-     }
- 
 diff --git a/src/main/java/org/bukkit/craftbukkit/entity/CraftHumanEntity.java b/src/main/java/org/bukkit/craftbukkit/entity/CraftHumanEntity.java
 index 2f5704b19148f390402c0823030806ba96860286..74f1af3dccddf52965e5c91277be3592649e8cfa 100644
 --- a/src/main/java/org/bukkit/craftbukkit/entity/CraftHumanEntity.java