Updated Upstream (CraftBukkit)

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:
03b725233 SPIGOT-6823: Fix loading custom world in combination with superflat
359d0533a #970: Correct typo in README.md
110492932 Fix per-world worldborder command

patches/server/0034-Optimize-explosions.patch

@@ -25,10 +25,10 @@ index bc35bdd9cbd544ae2ab27ad042d7d1b3166db9a6..2b0a75dc2e292e655ca3300f64bc1211
 +    }
  }
 diff --git a/src/main/java/net/minecraft/server/MinecraftServer.java b/src/main/java/net/minecraft/server/MinecraftServer.java
-index 608b6218f5c59ecb3e7137121b8c4c2188479297..5cf85636e089a4bf2422d76b8df52c1166d3f148 100644
+index b86ceda8f7376334987955095234bdecec5af414..9d6daeba112e68c64c2b5d7d0c7717766913fd56 100644
 --- a/src/main/java/net/minecraft/server/MinecraftServer.java
 +++ b/src/main/java/net/minecraft/server/MinecraftServer.java
-@@ -1405,6 +1405,7 @@ public abstract class MinecraftServer extends ReentrantBlockableEventLoop<TickTa
+@@ -1406,6 +1406,7 @@ public abstract class MinecraftServer extends ReentrantBlockableEventLoop<TickTa
  
              this.profiler.pop();
              this.profiler.pop();
@@ -135,7 +135,7 @@ index 996e02be9f3150ba125d52e3d544599c2b8dd968..688ebb68209beb4550293f72b1fa7b39
 +    // Paper end
  }
 diff --git a/src/main/java/net/minecraft/world/level/Level.java b/src/main/java/net/minecraft/world/level/Level.java
-index 1195a4b79103d62ed4f8c91dd36ccd77fa561f01..d8da1dfdc58726eda01e1bfb059c144e98ce7fe8 100644
+index 8a2d18524e089cdc07125e424b37f1b629e591a6..4c049a41035824a9affdf25495a658a0c58dcd75 100644
 --- a/src/main/java/net/minecraft/world/level/Level.java
 +++ b/src/main/java/net/minecraft/world/level/Level.java
 @@ -156,6 +156,7 @@ public abstract class Level implements LevelAccessor, AutoCloseable {