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/Optimize-World.isLoaded-BlockPosition-Z.patch

@@ -6,10 +6,10 @@ Subject: [PATCH] Optimize World.isLoaded(BlockPosition)Z
 Reduce method invocations for World.isLoaded(BlockPosition)Z
 
 diff --git a/src/main/java/net/minecraft/server/World.java b/src/main/java/net/minecraft/server/World.java
-index 20e52fbcc8..6fe8ce96aa 100644
+index 0fd91a687e..0cf5d80899 100644
 --- a/src/main/java/net/minecraft/server/World.java
 +++ b/src/main/java/net/minecraft/server/World.java
-@@ -0,0 +0,0 @@ public abstract class World implements GeneratorAccess, IIBlockAccess, AutoClose
+@@ -0,0 +0,0 @@ public abstract class World implements IEntityAccess, GeneratorAccess, IIBlockAc
          return this.getType(blockposition).isAir();
      }
  
@@ -19,5 +19,5 @@ index 20e52fbcc8..6fe8ce96aa 100644
 +
      // Paper start
      public Chunk getChunkIfLoaded(BlockPosition blockposition) {
-         return ((ChunkProviderServer) this.chunkProvider).getChunkIfLoaded(blockposition.getX() >> 4, blockposition.getZ() >> 4);
+         return getChunkIfLoaded(blockposition.getX() >> 4, blockposition.getZ() >> 4);
 --