Add BlockEnderPortal for diff visibility

src/main/java/net/minecraft/server/BlockEnderPortal.java

@@ -0,0 +1,56 @@
+package net.minecraft.server;
+
+import java.util.List;
+import java.util.Random;
+
+public class BlockEnderPortal extends BlockContainer {
+
+    public static boolean a = false;
+
+    protected BlockEnderPortal(int i, Material material) {
+        super(i, 0, material);
+        this.a(1.0F);
+    }
+
+    public TileEntity a(World world) {
+        return new TileEntityEnderPortal();
+    }
+
+    public void updateShape(IBlockAccess iblockaccess, int i, int j, int k) {
+        float f = 0.0625F;
+
+        this.a(0.0F, 0.0F, 0.0F, 1.0F, f, 1.0F);
+    }
+
+    public void a(World world, int i, int j, int k, AxisAlignedBB axisalignedbb, List list, Entity entity) {}
+
+    public boolean c() {
+        return false;
+    }
+
+    public boolean b() {
+        return false;
+    }
+
+    public int a(Random random) {
+        return 0;
+    }
+
+    public void a(World world, int i, int j, int k, Entity entity) {
+        if (entity.vehicle == null && entity.passenger == null && !world.isStatic) {
+            entity.b(1);
+        }
+    }
+
+    public int d() {
+        return -1;
+    }
+
+    public void onPlace(World world, int i, int j, int k) {
+        if (!a) {
+            if (world.worldProvider.dimension != 0) {
+                world.setTypeId(i, j, k, 0);
+            }
+        }
+    }
+}