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-Server-Patches/0195-Implement-ensureServerConversions-API.patch

@@ -0,0 +1,26 @@
+From 9eec798ed47a25bd4d1975b924ebe06a5a6d873a Mon Sep 17 00:00:00 2001
+From: Aikar <aikar@aikar.co>
+Date: Wed, 4 May 2016 22:43:12 -0400
+Subject: [PATCH] Implement ensureServerConversions API
+
+This will take a Bukkit ItemStack and run it through any conversions a server process would perform on it,
+to ensure it meets latest minecraft expectations.
+
+diff --git a/src/main/java/org/bukkit/craftbukkit/inventory/CraftItemFactory.java b/src/main/java/org/bukkit/craftbukkit/inventory/CraftItemFactory.java
+index 6998fddc5a..f7e11412a5 100644
+--- a/src/main/java/org/bukkit/craftbukkit/inventory/CraftItemFactory.java
++++ b/src/main/java/org/bukkit/craftbukkit/inventory/CraftItemFactory.java
+@@ -289,4 +289,10 @@ public final class CraftItemFactory implements ItemFactory {
+     public Material updateMaterial(ItemMeta meta, Material material) throws IllegalArgumentException {
+         return ((CraftMetaItem) meta).updateMaterial(material);
+     }
++    // Paper start
++    @Override
++    public ItemStack ensureServerConversions(ItemStack item) {
++        return CraftItemStack.asCraftMirror(CraftItemStack.asNMSCopy(item));
++    }
++    // Paper end
+ }
+-- 
+2.18.0
+