gcm-viewer: Make the UI more compact
- Replace main GtkBox with GtkPaned to allow dynamic sizing.
- Add the information panel into a scrolled window.
- Mark GtkNotebook as scrollable.
- Wrap text on long labels.
- Allow horizontal scrolling of the profiles list.
- Set default size for the application window.
This allows to fit the application window into smaller screens.
Edited by Balló György