Folders in Lists

Hello.

I would like to be able to group materials, vertex groups, vertex colors into folders. Since sometimes there can be a lot of vertex groups and for a long time I have been looking for the desired vertex group. In the interface, it may look like this: i.imgur.com/xBdaJsc.jpg

You need to add the ability to open and close folders. If the folder is closed, then the bone names will not be visible in the list.

This function is needed to make it easier for the user to find bones or materials or the colors of the vertices.