Add preLoad function to instance copy

Author: krypciak

src/instance-copy.ts

@@ -272,7 +272,8 @@ export async function copyInstance(
     s: InstanceinatorInstance,
     name?: string,
     display?: boolean,
-    forceDraw?: boolean
+    forceDraw?: boolean,
+    preLoad?: (inst: InstanceinatorInstance) => void
 ): Promise<InstanceinatorInstance> {
     if (!classes) initClasses()
 
@@ -293,6 +294,8 @@ export async function copyInstance(
 
     ig.initGameAddons = () => gameAddons
 
+    if (preLoad) preLoad(ns)
+
     ig.ready = true
     ig.mainLoader = new sc.StartLoader(classes.CrossCode)
     ig.mainLoader.load()