[Bleeding] Cleanup clone methods.

By: Wesley Wolfe <weswolf@aol.com>

paper-api/src/main/java/org/bukkit/material/MaterialData.java

@@ -6,7 +6,7 @@ import org.bukkit.Material;
 /**
  * Handles specific metadata for certain items or blocks
  */
-public class MaterialData {
+public class MaterialData implements Cloneable {
     private final int type;
     private byte data = 0;
 
@@ -102,4 +102,13 @@ public class MaterialData {
             return false;
         }
     }
+
+    @Override
+    public MaterialData clone() {
+        try {
+            return (MaterialData) super.clone();
+        } catch (CloneNotSupportedException e) {
+            throw new Error(e);
+        }
+    }
 }