Begin new model system

Includes some examples for both ways.

src/main/java/WayofTime/bloodmagic/client/IMeshProvider.java

@@ -0,0 +1,19 @@
+package WayofTime.bloodmagic.client;
+
+import net.minecraft.client.renderer.ItemMeshDefinition;
+import net.minecraftforge.fml.relauncher.Side;
+import net.minecraftforge.fml.relauncher.SideOnly;
+
+import java.util.List;
+
+/**
+ * Provides a custom {@link ItemMeshDefinition} for automatic registration of
+ * renders.
+ */
+public interface IMeshProvider {
+
+    @SideOnly(Side.CLIENT)
+    ItemMeshDefinition getMeshDefinition();
+
+    List<String> getVariants();
+}