ENH: UI Improvement

[teddyrendahl]

General list of Improvement Ideas

• [ ] Insert button for devices
• [x] Convert to a GridLayout for cleaner formatting
• [ ] Display path impediment at the top of the box. Focus on device, from click
• [ ] Frame entire row to indicate MPS status

[teddyrendahl]

Removing PyDMComboBox request. This should be done by a https://github.com/pcdshub/typhon screen