Feature Request: Add support for colorbars

[nickbsb]

Please consider adding support for vertical orientation of inset colorbars, as it is useful for geographic and remote sensing visualizations.Thanks.

[cvanelteren]

Sounds like a good feature. I am rather busy at the moment with other issues, but we welcome PRs. Have a look at our contributing guide or #298

[cvanelteren]

Had some time, implemented in #301

[cvanelteren]

Added on main.