Move old css_styled_content static templates to own extension
css_styled_content provides several static templates that enable to render the frontend in the same way as some older TYPO3 version. We currently ship static templates as old as TYPO3 3.8. The whole list appears in the "Include Template from Extension" list and the list is getting longer each release.
To make it clearer that these templates are not maintained anymore, and new installations should be given these by default, we decided to move these over to a new System Extension which is not installed by default, but can be installed through the Upgrade Wizard if someone decides to stay with older compatibility version.
Proposal for new extension name: csc_oldtemplates
We decided to keep the extension in the core thou so that potential changes and fixes could be more easily be done by the core team itself directly in the core.