Standardize hiding text pane

[Hexman768]

Description

The behavior that is currently only available when working with large files to hide the text pane should be standard for all files.

If a user has chosen to use this app, it means they are likely going to be interacting mainly with the structure view.

Notes

All buttons available only in the text view should be moved to the structure view.

[Hexman768]

Added won't fix label for now until I get a better idea of how people are actually using the app, I want to provide the option to see the JSON text all the time still.