Paper 1.13.1 Update

Updated Upstream (Bukkit/CraftBukkit/Spigot)

Bukkit Changes:
2dcc44dc SPIGOT-4307: Fix hacky API for banners on shields
e0fc6572 SPIGOT-4309: Add "forced" display of particles
efeeab2f Add index to README.md for easier navigation
f502bc6f Update to Minecraft 1.13.1

CraftBukkit Changes:
d0bb0a1d Fix some tests randomly failing
997d378d Fix client stall in specific teleportation scenarios
b3dc2366 SPIGOT-4307: Fix hacky API for banners on shields
2a271162 SPIGOT-4301: Fix more invalid enchants
5d0d83bb SPIGOT-4309: Add "forced" display of particles
a6772578 Add additional tests for CraftBlockData
ce1af0c3 Update to Minecraft 1.13.1

Spigot Changes:
2440e189 Rebuild patches
4ecffced Update to Minecraft 1.13.1

Spigot-API-Patches/Vex-getSummoner-API.patch

@@ -6,14 +6,10 @@ Subject: [PATCH] Vex#getSummoner API
 Get's the Mob that summoned this Vex
 
 diff --git a/src/main/java/org/bukkit/entity/Vex.java b/src/main/java/org/bukkit/entity/Vex.java
-index a2f2fcaec..734683763 100644
+index a2f2fcaec..d395e405d 100644
 --- a/src/main/java/org/bukkit/entity/Vex.java
 +++ b/src/main/java/org/bukkit/entity/Vex.java
-@@ -0,0 +0,0 @@
- package org.bukkit.entity;
- 
-+import com.destroystokyo.paper.entity.SentientNPC;
-+
+@@ -0,0 +0,0 @@ package org.bukkit.entity;
  /**
   * Represents a Vex.
   */
@@ -21,11 +17,7 @@ index a2f2fcaec..734683763 100644
 +public interface Vex extends Monster {
 +    /**
 +     * @return What Entity (most likely an Evoker, but not guaranteed) summoned this Vex
-+     * @deprecated Use {@link #getSummoner()}
 +     */
-+    @Deprecated
-+    default SentientNPC getOwner() { return (SentientNPC) getSummoner(); } // Paper
-+
 +    Mob getSummoner(); // Paper
 +
 +}