Add sidebar category context menu to show and hide categories

Suggesting to add a sidebar category context menu that allows user to choose which items are shown or hidden.
Can copy the same approach used by Thunar sidebar category context menu.

Context menu would contain the category names shown as flyout menus.
When you hover mouse cursor over each category name flyout, it automatically opens the flyout menu.
Each flyout shows all the items shown within that category with check boxes for user to choose which items they would like to show/hide.

-File Type
-Modified
-Preferences (if the following post request gets added #122)

Thank You