Add video export with modal dialog for frame number

[rlafuente]

• https://flight-manual.atom.io/api/v1.56.0/Workspace/#instance-addModalPanel
• https://discuss.atom.io/t/how-can-i-prompt-a-user-for-input-and-use-this-as-a-variable-in-my-package/30342/2
• https://discuss.atom.io/t/how-do-you-ask-the-user-for-input/56084
• https://github.com/kgrossjo/atom-man/blob/master/lib/man-view.js

[stuaxo]

Is this meant to be in the shoebot project ?

[rlafuente]

oh shoot, it should have gone into atom-shoebot!