Add additional info like signatures to functions like in tagbar

[PlasmaHH]

Is your feature request related to a problem? Please describe.
I often have lots of overloads and while tagbar shows them with their signatures, vista does only show the names.

Describe the solution you'd like
Add an option to display a functions signature. Additionally display as symbols or in any way for member functions whether they are public or protected or similar. ( Also it would probably be better to sort member functions into their respecitve classes if possible )

Additional context

vista on the left, tagbar on the right. You can see the + for public (uses - and # for private and protected respectively) and sorts the member functions into their respective classes.

[thissell]

Bumping this. I was expecting signatures as well.