new(core.gbapp): Better support for instance params.

src/GBMinInstance.ts

@@ -59,6 +59,7 @@ export class GBMinInstance {
   userProfile: any;
   whatsAppDirectLine: any;
 
+
   cbMap: {};
   scriptMap: {};
   sandBoxMap: {};

src/IGBCoreService.ts

@@ -62,4 +62,5 @@ export interface IGBCoreService {
     installWebHook(isGet: boolean, url: string, callback: any);
     setWWWRoot(localPath: string);
     setEntryPointDialog(dialogName: string);
+    getParam<T>(instance: IGBInstance, name: string, defaultValue?: T): any;
 }