resolve loadURL blank screen issue

[kapilrc]

With the base code, the loadURL returned blank html screen. This changes resolves the relative path issue and loads the requested URL.

[NeoLegends]

Thanks! The changes as they currently are, however, would lead to the plugin being unable to load internet urls (as in e. g. https://google.com/). In Festify, however, we need to load internet URLs, so we cannot accept this as-is.

I suggest you add a second function to the ExternalScreen class that is specialized on loading URLs relative to the app package (e. g. loadLocalUrl) that then performs the string formatting and loads the formatted URL.

[kapilk2]

This is a great idea for loading local and web Urls. thanks