Add TileEntityNote from mc-dev for diff visibility.

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

@@ -0,0 +1,56 @@
+package net.minecraft.server;
+
+public class TileEntityNote extends TileEntity {
+
+    public byte note = 0;
+    public boolean b = false;
+
+    public TileEntityNote() {}
+
+    public void b(NBTTagCompound nbttagcompound) {
+        super.b(nbttagcompound);
+        nbttagcompound.setByte("note", this.note);
+    }
+
+    public void a(NBTTagCompound nbttagcompound) {
+        super.a(nbttagcompound);
+        this.note = nbttagcompound.getByte("note");
+        if (this.note < 0) {
+            this.note = 0;
+        }
+
+        if (this.note > 24) {
+            this.note = 24;
+        }
+    }
+
+    public void c() {
+        this.note = (byte) ((this.note + 1) % 25);
+        this.update();
+    }
+
+    public void play(World world, int i, int j, int k) {
+        if (world.getMaterial(i, j + 1, k) == Material.AIR) {
+            Material material = world.getMaterial(i, j - 1, k);
+            byte b0 = 0;
+
+            if (material == Material.STONE) {
+                b0 = 1;
+            }
+
+            if (material == Material.SAND) {
+                b0 = 2;
+            }
+
+            if (material == Material.SHATTERABLE) {
+                b0 = 3;
+            }
+
+            if (material == Material.WOOD) {
+                b0 = 4;
+            }
+
+            world.playNote(i, j, k, b0, this.note);
+        }
+    }
+}