Provide a way to control escaping of content through TypoScript
Currently, we always use f:format.raw ViewHelper inside all Content Element templates... The
problem with that is that it's very unsafe, disabling the complete security which was in-built.
Enabling it in all cases is not nice as well, as we need to control that on a case-by-case basis.
That's why we want to introduce a SafeString class, which is directly rendered without any escaping; while in the default case,
the escaping should stay active.