Scales - please let us import/export config

[kazerniel]

Description

It would be useful to be able to re-visit previously set-up colour scales either via exposing the parameters in the URL (like this app does) or have some other way of exporting and importing configurations.

Why do you need this feature?

I'm working with multiple colour gradients for my organisation, and depending on the specific use case I need the hex codes for varying amounts of stops on them. The way the app currently is, I need to re-input all the key colours and all other config options each time I open the app. Implementing a config export/import feature would save me a lot of hassle.