Fix some nasty bug

plugos/environments/iframe_sandbox.ts

@@ -44,6 +44,7 @@ class IFrameWrapper implements WorkerLike {
   }
 
   terminate() {
+    console.log("Terminating iframe sandbox");
     window.removeEventListener("message", this.messageListener);
     return this.iframe.remove();
   }

plugos/system.ts

@@ -87,6 +87,7 @@ export class System<HookT> extends EventEmitter<SystemEvents<HookT>> {
     sandboxFactory: SandboxFactory<HookT>
   ): Promise<Plug<HookT>> {
     if (this.plugs.has(name)) {
+      console.log("Unloading", name);
       await this.unload(name);
     }
     // Validate