Edit AddFiles & Packages

[Luffyyy]

Is your feature request related to a problem? Please describe.
Adding files into add files/packages (custom assets) can be a pain, why not simplify this?

Describe the solution you'd like
The solution that is worked on at the moment is adding files/folders and letting the editor add it for you. We need to also add support for modules that have the file= value (if you wish to not clutter the main.xml)
At the moment, if one of the assets doesn't exist, and it's a game asset, it will load it from DB.

Possibly also support add.xml.

Additional context