Checkstyle cleanup

Author: octylFractal

worldedit-bukkit/adapters/adapter-1.21/src/main/java/com/sk89q/worldedit/bukkit/adapter/impl/v1_21/PaperweightAdapter.java

@@ -174,7 +174,6 @@
 import org.spigotmc.SpigotConfig;
 import org.spigotmc.WatchdogThread;
 
-import java.lang.ref.WeakReference;
 import java.lang.reflect.Field;
 import java.lang.reflect.InvocationTargetException;
 import java.lang.reflect.Method;

worldedit-bukkit/adapters/adapter-1.21/src/main/java/com/sk89q/worldedit/bukkit/adapter/impl/v1_21/wna/PaperweightNativeChunkSection.java

@@ -33,7 +33,6 @@
 
 import java.lang.invoke.MethodHandle;
 import java.lang.invoke.MethodHandles;
-import java.lang.invoke.MethodType;
 import java.lang.reflect.Field;
 import java.lang.reflect.Method;
 

worldedit-core/src/main/java/com/sk89q/worldedit/internal/wna/NativeChunkSection.java

@@ -53,7 +53,7 @@ public interface NativeChunkSection {
     NativeBlockState getBlock(int i, int j, int k);
 
     /**
-     * Is this section made of only air (specifically, {@link BlockMaterial#isAir()})?
+     * Get if this section is made of only air (specifically, {@link BlockMaterial#isAir()}).
      *
      * @return true if the section is only air
      */

worldedit-core/src/main/java/com/sk89q/worldedit/internal/wna/NativeWorld.java

@@ -19,7 +19,6 @@
 
 package com.sk89q.worldedit.internal.wna;
 
-import com.sk89q.worldedit.util.SideEffectSet;
 import org.enginehub.linbus.tree.LinCompoundTag;
 
 /**