Implement screen scrolling

[zacck-zz]

Feature
We need a feature that enables us to scroll or shift the screen in either direction. This will be useful when displaying large tokens (larger than 16 characters) as it will enable us to take the viewed portion out of the screen and bring in the unseen portion of the token to focus.

Describe the solution you'd like
We should have a setting to keep scrolling the screen that can be enabled and disabled as the user wishes

Additional context
We need to consider carefully how to do this so as to avoid corrupting the screen's state or making interaction with the screen unnecessarily difficult so we need to be careful which situations we allow scrolling in and which ones we don't