Remove deprecated spigotcore api usage

pom.xml

@@ -32,6 +32,7 @@
                 <configuration>
                     <source>1.8</source>
                     <target>1.8</target>
+                    <compilerArgs>-Xlint</compilerArgs>
                 </configuration>
             </plugin>
         </plugins>

src/de/steamwar/misslewars/FightWorld.java

@@ -21,7 +21,7 @@
 
 package de.steamwar.misslewars;
 
-import de.steamwar.core.events.ChunkListener;
+import de.steamwar.core.CraftbukkitWrapper;
 import net.minecraft.server.v1_15_R1.Chunk;
 import org.bukkit.Bukkit;
 import org.bukkit.World;
@@ -96,7 +96,7 @@ public class FightWorld {
         chunk.heightMap.clear();
         chunk.heightMap.putAll(backupChunk.heightMap);
         for(Player p : Bukkit.getOnlinePlayers()){
-            ChunkListener.sendChunk(p, x, z);
+            CraftbukkitWrapper.impl.sendChunk(p, x, z);
         }
     }
 }