Add customisable export path to settings window

[henninggross]

In our project we have the need to store the Unity exports in a different directory than ios/UnityLibrary/ / android/unityLibrary respectively.

For now we change androidExportPath and iosExportPath in Build.cs directly but it would be great if the plugin would give us the option to update the default export paths somewhere in the 'Flutter Unity Widget Settings' the same way it is done for pluginMode.

[dawiddszewczyk]

@Ahmadre What do you think about that? :)

[Ahmadre]

@Ahmadre What do you think about that? :)

I like this idea.

I will try to work next week on a solution with extending the options in our Unity GUI to current export paths for all platforms.

I think that would make the UX better.

[Ahmadre]

Please follow: https://github.com/juicycleff/flutter-unity-view-widget/tree/feature/custom_export_paths