Changed Super Pickaxe to use EditSession.

This fixes WORLDEDIT-3102 and allows the logging of Super Pickaxe
usage via the EditSession Extent pipeline.

src/main/java/com/sk89q/worldedit/world/NullWorld.java

@@ -0,0 +1,98 @@
+/*
+ * WorldEdit, a Minecraft world manipulation toolkit
+ * Copyright (C) sk89q <http://www.sk89q.com>
+ * Copyright (C) WorldEdit team and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License as published by the
+ * Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
+ * for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package com.sk89q.worldedit.world;
+
+import com.sk89q.worldedit.*;
+import com.sk89q.worldedit.blocks.BaseBlock;
+import com.sk89q.worldedit.blocks.BaseItemStack;
+import com.sk89q.worldedit.blocks.BlockID;
+import com.sk89q.worldedit.regions.Region;
+import com.sk89q.worldedit.util.TreeGenerator.TreeType;
+
+/**
+ * A null implementation of {@link World} that drops all changes and
+ * returns dummy data.
+ */
+public class NullWorld extends AbstractWorld {
+
+    @Override
+    public String getName() {
+        return "null";
+    }
+
+    @Override
+    public boolean setBlock(Vector position, BaseBlock block, boolean notifyAndLight) throws WorldEditException {
+        return false;
+    }
+
+    @Override
+    public int getBlockLightLevel(Vector position) {
+        return 0;
+    }
+
+    @Override
+    public boolean clearContainerBlockContents(Vector position) {
+        return false;
+    }
+
+    @Override
+    public BiomeType getBiome(Vector2D position) {
+        return null;
+    }
+
+    @Override
+    public void setBiome(Vector2D position, BiomeType biome) {
+    }
+
+    @Override
+    public void dropItem(Vector position, BaseItemStack item) {
+    }
+
+    @Override
+    public int killMobs(Vector origin, double radius, int flags) {
+        return 0;
+    }
+
+    @Override
+    public int removeEntities(EntityType type, Vector origin, int radius) {
+        return 0;
+    }
+
+    @Override
+    public boolean regenerate(Region region, EditSession editSession) {
+        return false;
+    }
+
+    @Override
+    public boolean generateTree(TreeType type, EditSession editSession, Vector position) throws MaxChangedBlocksException {
+        return false;
+    }
+
+    @Override
+    public BaseBlock getBlock(Vector position) {
+        return new BaseBlock(BlockID.AIR);
+    }
+
+    @Override
+    public BaseBlock getLazyBlock(Vector position) {
+        return new BaseBlock(BlockID.AIR);
+    }
+
+}