Input directory could work with symbolic links.

[ppcano]

To improve package management, i would like to place symbolic links in my Assetfile input folder.

On this way, i could reuse my packages on different projects and all the projects will use the same instance of my package. I could only need to update the global package to update all the symlinks as well.

This feature is not currently supported, now it won't output any files when using symbolic links.