Open multiple folders at once

[danrubel]

[user feedback]
The open folder option does not have the provision to select multiple folders at once. I think it would be great as it enables the developer to load multiple projects at once.

[danrubel]

Added this to the Later milestone.

[kasperl]

Removed this from the Later milestone.
Added Oldschool-Milestone-Later label.

[sethladd]

Added NotPlanned label.

[clayberg]

Added this to the 1.6 milestone.