Option to turn on/off view sections

[robert-m]

Love the package! Any chance you can add the option to show or hide the Git Modified or Open Files from the tree-view. Or, maybe have the option to automatically show the Open Files section when the user reaches a certain number of open file/tabs. That way if I only have 3 or 4 files opened I only see the Git Modified section and makes the tree-view cleaner.

Thanks!
Rob