Allow the output view to be moved/opened as both a panel view and in the editor area

It is nice to be able to move the Calva Output Terminal to panels and also to the editor area. It is a bit quirky though, especially after restart, and hard to control. Also the terminal has it's limitations in many ways. So a less limited output view that we can choose better where it is opened would be stellar.

Related:

* #2480 