Moved ItemBlockHolder over from FM mod

Designed to be a very simple ItemBlock class to be used with a block for
better metadata control.

src/dark/core/items/ItemBlockHolder.java

@@ -0,0 +1,30 @@
+package dark.core.items;
+
+import net.minecraft.block.Block;
+import net.minecraft.item.ItemBlock;
+import net.minecraft.item.ItemStack;
+
+/** Simple itemBlock class for quick use with a block
+ *
+ * @author Darkguardsman */
+public class ItemBlockHolder extends ItemBlock
+{
+    public ItemBlockHolder(int id)
+    {
+        super(id);
+        this.setMaxDamage(0);
+        this.setHasSubtypes(true);
+    }
+
+    @Override
+    public int getMetadata(int damage)
+    {
+        return damage;
+    }
+
+    @Override
+    public String getUnlocalizedName(ItemStack itemStack)
+    {
+        return Block.blocksList[this.getBlockID()].getUnlocalizedName() + "." + itemStack.getItemDamage();
+    }
+}