Implement EndGateway state

By: Matthew <stteg@hotmail.com>

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

@@ -272,6 +272,8 @@ public class CraftBlock implements Block {
             return new CraftDispenser(this);
         case DROPPER:
             return new CraftDropper(this);
+        case END_GATEWAY:
+            return new CraftEndGateway(this);
         case HOPPER:
             return new CraftHopper(this);
         case MOB_SPAWNER:

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

@@ -0,0 +1,40 @@
+package org.bukkit.craftbukkit.block;
+
+import net.minecraft.server.TileEntityEndGateway;
+import org.bukkit.Material;
+import org.bukkit.block.Block;
+import org.bukkit.block.EndGateway;
+import org.bukkit.craftbukkit.CraftWorld;
+
+public class CraftEndGateway extends CraftBlockState implements EndGateway {
+
+    private TileEntityEndGateway gateway;
+
+    public CraftEndGateway(Block block) {
+        super(block);
+
+        CraftWorld world = (CraftWorld) block.getWorld();
+        gateway = (TileEntityEndGateway) world.getTileEntityAt(getX(), getY(), getZ());
+    }
+
+    public CraftEndGateway(final Material material, TileEntityEndGateway te) {
+        super(material);
+        this.gateway = te;
+    }
+
+    @Override
+    public boolean update(boolean force, boolean applyPhysics) {
+        boolean result = super.update(force, applyPhysics);
+
+        if (result) {
+            gateway.update();
+        }
+
+        return result;
+    }
+
+    @Override
+    public TileEntityEndGateway getTileEntity() {
+        return gateway;
+    }
+}