refactor: Flattened the runestone blocks

src/main/java/electroblob/wizardry/item/ItemCrystal.java

@@ -1,16 +1,21 @@
 package electroblob.wizardry.item;
 
+import electroblob.wizardry.api.IElemental;
+import electroblob.wizardry.constants.Element;
 import electroblob.wizardry.registry.WizardryTabs;
 import net.minecraft.item.Item;
 
-/** Note that in 1.13, <i>the flattening</i> will make this class redundant, much like ItemCoal, which is probably its
- * closest analog in vanilla. */
-public class ItemCrystal extends Item {
+public class ItemCrystal extends Item implements IElemental {
 
-	public ItemCrystal(){
+	private final Element element;
+
+	public ItemCrystal(Element element) {
 		super();
-        this.setMaxDamage(0);
-        this.setCreativeTab(WizardryTabs.WIZARDRY);
-    }
+		this.setMaxDamage(0);
+		this.setCreativeTab(WizardryTabs.WIZARDRY);
+		this.element = element;
+	}
 
+	@Override
+	public Element getElement() { return element; }
 }