Add Packages Directory to the standard selections

Well, this is just something I think that was missing, feel free to merge.

Other interesting things (paths) that I could not really find when scanning the code:
- Project root folder(s)
- Costum paths you are browsing often (e.g. added by a setting)

Of course, all of this is "optional" and kinda user-depended but they could be added as an option and I don't see anything against the setting thing.