[!!!][FEATURE] Streamline Fluid Styled Content and CSS Styled Content

CSS Styled Content has been a long time the preferred way of rendering
content in the frontend. Fluid Styled Content was introduced as
successor of CSC, but the feature set diverged from the beginning. The
lack of flexibility and incomplete feature set in comparision to CSC
made it hard to migrate existing instances.

Since TYPO3 CMS 7.6 Fluid-Templates are the defined standard and
official recommendation for content rendering. The feature set of FSC is
now matching CSC. Both content renderings are now streamlined to be
fully compatible with each other. For the period of CMS 8 LTS CSC will
share the same capabilities to make an transition as easy as possible.
CSC is now deprecated and goes into maintenance mode and will be removed
with CMS 9.

For compatibility, CSC is now supporting Textmedia that was before
exclusive to FSC. But also FSC has learned some tricks from CSC. Fluid
Styled Content has now support for all content elements pr...