Add a "go back" "go next" buttons in the code editor

[fidel-perez]

Brief summary of issue / Description of requested feature:

A "go back / go forward" button would help greatly to those of us with terrible memory.

Steps to reproduce the issue / Reasons for adding feature:

The buttons should move the character / selected file in the code editor to the previous / next known location.
This way, when you search for a snippet in your code, and want to go back, you don't need to do so by memory.
This is a very common feature on most IDEs and when you get used to it there is no going back :)