Add support for Windows 10 style start menu, but with support for cascasing folders

[DManowitz]

Is your feature request related to a problem? Please describe.

Follow-on to #1851

Describe the solution you'd like

One thing I don't like about the Windows 10 start menu is the lack of support for cascading menus if there are multiple levels of folders in the Start Menu / Programs directory hierarchies. What I'd like to see in Open Shell is support for a Windows 10 style start menu (i.e., mixing of application links and folders together alphabetically, with letter separators), but with added support for cascading menus, like the Windows 7 style start menu has.

Area of issue

Start menu

Alternatives you've considered

No response

Additional context

If you have the desire and ability to do this, it would be appreciated.