Concise layout

[Nosille]

I run multiple cameras and as a result frequently want the images and graph in database viewer to be bigger. These changes enable a mode that hides parts of the interface to make that true.

[matlabbe]

Are changes in PreferencesDialog needed? It seems only DatabaseViewer needs to be updated.

[Nosille]

I used VerticalLayout as a template, and it included definitions in the PreferencesDialog. I assume that without the entries in PreferencesDialog it will not save the configuration between sessions. I will see what happens when I remove it and get back to you.

[matlabbe]

The config in Preferences affects the layout under MainWindow. The config in DatabaseViewer is saved on its own. EDIT: the vertical layout option is also used in MainWindow, that's why it appears two times.

[matlabbe]

I tested it and we don't need the changes from Preferences to save/reload the config. I removed those changes. I updated the PR to not draw matching lines and to be able to click on graph view's nodes to always change graphics view A.

Thanks for the PR, I like this view mode.