Tweaks for the BE module

[kitzberger]

Just discovered the BE module this extension provides. Great stuff ;-)

The following layout tweaks come to mind though:

• Put the settings dropdowns next to each other in the header part
• Waste no space to the left and right

Together with these usability tweaks it'll be the perfect tool for me to work on the rendered JSON:

• Keep the selected 'tab' in the BE user session to make switching pages easier
• Add a new input field where the user can enter some kind of selector to highlight a custom JSON node (additionally to the tabs)

Something like this:

Before	After