Feature request: Sorting of reqion by attributes

Hello!

It would be much more handy if you add function to sort regions by features. And for better visibility it would be useful to add function to set different colors of outline for different types of regions (regions with different features) and toggle/untoggle different types of regions (with different features). It will improve visibility and make working with many regions easier (when we work with grains in thin sections there are many regions - sometimes more than 500). Sorting of regions by feature is very important for creating of database for machine learning algorythms

Thank you for collaboration.

Best wishes, Yulia