Use config file to determine if we should show Active Learning button

[manthey]

Currently, we show the Active Learning button if a folder has a particular piece of metadata. We could add something to the config file so that all subfolders would automatically have the Active Learning button (and clicking on it would add the necessary metadata if it s actually required). This should probably be sophisticated enough to not show it in the project-specific subfolders for annotations, models, and features, or we should be smart enough to open the parent folder in those locations.

This would make creating a new project only require creating a folder and moving or upload some images into it.