Create workspaces

[Jense5]

Make it possible to combine the batch functionality in a workspace kind of way.
This makes it possible to kind of categorise boilerplates so you always have the ones you need.
Provides a better user experience.

Usage Example

# Switch to 'mobile' workspace
$ cst workspace mobile
$ cst list
- React Native Component
- Android App
- ...

# Switch to 'web' workspace
$ cst workspace web
$ cst list
- React Application
- Server
- ...

Batch Example

{
    "data": {
        "web": [ "..." ],
        "mobile": [ "..." ]
    }
}