SKU-1098 #comment Create function to check URL parameters

For example:

URL: http://localhost:8081/**?plugin=true&filemanager=true**

```javascript
if (!Settings.INITIAL_QUERY && Saiku.URLParams.equals({plugin: true, filemanager: true})) {
    Saiku.tabs.add(new SplashScreen(), false);
}
else {
    Saiku.tabs.add(new Workspace());
}
```