Change how blocks/items are registered (desc)

tterrag is a meany face and yelled at me for using class.getSimpleName(). So here's an API-friendly re-work of the registration system. This allows all our Items/Blocks to be obtained via the API. Just add a new enum.

src/main/java/WayofTime/bloodmagic/item/ItemBucketEssence.java

@@ -13,6 +13,7 @@ public class ItemBucketEssence extends ItemBucket
         super(ModBlocks.lifeEssence);
 
         setUnlocalizedName(Constants.Mod.MODID + ".bucket.lifeEssence");
+        setRegistryName(Constants.BloodMagicItem.BUCKET_ESSENCE.getRegName());
         setContainerItem(Items.bucket);
         setCreativeTab(BloodMagic.tabBloodMagic);
     }