Introduce fullwith CE

As an editor I want to use content elements, with a full coloured background.

It should be capable to go fullwith and to contain different types of content. Next to that it must be possible to configure the backend to the colors or gradients of the styleguide

AC:

• Create a concepts for Introduce fullwith CE
• Create a ticket to implement the changes in the SASS / CSS and HTML Prototype
• Create a ticket to implement the integration via container elements and or content elements (frames)