[WIP] Enable inline usage of flexform data viewhelper

Useful in combination with ``v:content.get`` or other situations where raw records (arrays) are available.
Nah, the tests need to be changed because they don't consider the record being set through the viewhelper's content. Plus ``$table`` and ``$field`` are not required when used inline so I guess this is not such a good idea. Could it be moved to the record service to always have an array in each record?