Registration rework (#3018)

Refactored component registration.

Fixes #3008: crank rendering

src/main/java/appeng/bootstrap/components/IItemRegistrationComponent.java

@@ -0,0 +1,16 @@
+
+package appeng.bootstrap.components;
+
+
+import net.minecraft.item.Item;
+import net.minecraftforge.fml.relauncher.Side;
+import net.minecraftforge.registries.IForgeRegistry;
+
+import appeng.bootstrap.IBootstrapComponent;
+
+
+@FunctionalInterface
+public interface IItemRegistrationComponent extends IBootstrapComponent
+{
+	void itemRegistration( Side side, IForgeRegistry<Item> itemRegistry );
+}