#4433 standardize layouts

Standardizes layout views as requested in #4433

All layouts now support the same layout body elements (title, header, buttons, filter, content, footer). Using different layouts now only are used to differentiate between layout elements (such as one or 2 sidebars) or influence default behaviour (as the content layout defaults with a filter).

The PR also contains updates to all pages and pagehandlers that now can use the correct layout params.