Is your feature request related to a problem? Please describe.
Currently navigation is only possible via the tree view and getting to the next/previous declaration of some type (e.g. function) requires to open a few nodes in the tree.

Describe the solution you'd like
Buttons to navigate to the next/previous declaration in the selection view.
Navigating should be only between elements of the same type, e.g. param1 to param2...
After the last element of a type has been reached, jump to the first element of the next "parent" type. When the last/first element is selected, somehow show that in the buttons. Instead of of "next/previous" the buttons should show "go to beginning/go to end".

Buttons should be on the bottom left and right.