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/Sanitise-RegionFileCache-and-make-configurable.patch

@@ -25,7 +25,7 @@ index 620f23f4f0..a6042ca607 100644
 +    }
  }
 diff --git a/src/main/java/net/minecraft/server/RegionFileCache.java b/src/main/java/net/minecraft/server/RegionFileCache.java
-index ff473a263f..3b8d01ea1a 100644
+index 2217adf99c..c0ab543b91 100644
 --- a/src/main/java/net/minecraft/server/RegionFileCache.java
 +++ b/src/main/java/net/minecraft/server/RegionFileCache.java
 @@ -0,0 +0,0 @@ import java.io.IOException;
@@ -54,8 +54,8 @@ index ff473a263f..3b8d01ea1a 100644
  
              RegionFile regionfile1 = new RegionFile(file2);
 @@ -0,0 +0,0 @@ public class RegionFileCache {
-         }
      }
+     // CraftBukkit end
  
 +    // Paper Start
 +    private static synchronized void trimCache() {