UI/UX Overhaul - Reimplement UI as per our separate review doc.

[amyburness]

• [ ] #27
• [ ] #28
• [ ] #30
• [ ] #29
• [ ] #31

[timlinux]

More tasks:

Implement proper layout management throughout the tool.

With layouts properly applied, the gui should expand to fill the available space in its parent container. Without layouts, usability is degraded. In cases where there is long content, it should be placed in scrollable containers so that the user can access all parts of the UI. We can see here an example of where a button is not usable because it is partly hidden and it is not possible to scroll to it:

Also layouts will prevent elided text and mismatched object heights in the UI.