SPIGOT-2679: Add meta for StructureBlock

By: md_5 <git@md-5.net>

paper-server/src/main/java/org/bukkit/craftbukkit/block/CraftBlock.java

@@ -304,6 +304,8 @@ public class CraftBlock implements Block {
             return new CraftBanner(this);
         case FLOWER_POT:
             return new CraftFlowerPot(this);
+        case STRUCTURE_BLOCK:
+            return new CraftStructureBlock(this);
         default:
             return new CraftBlockState(this);
         }

paper-server/src/main/java/org/bukkit/craftbukkit/block/CraftStructureBlock.java

@@ -0,0 +1,23 @@
+package org.bukkit.craftbukkit.block;
+
+import net.minecraft.server.TileEntityStructure;
+import org.bukkit.Material;
+import org.bukkit.block.Block;
+import org.bukkit.craftbukkit.CraftWorld;
+
+public class CraftStructureBlock extends CraftBlockState {
+
+    private final TileEntityStructure structure;
+
+    public CraftStructureBlock(Block block) {
+        super(block);
+
+        this.structure = (TileEntityStructure) ((CraftWorld) block.getWorld()).getTileEntityAt(getX(), getY(), getZ());
+    }
+
+    public CraftStructureBlock(Material material, TileEntityStructure structure) {
+        super(material);
+
+        this.structure = structure;
+    }
+}