Order of dataProcessing, process dataProcessing on top level same as below

[lukaszuznanski]

Changing the dataprocessing on the toplevel JSON (not on the fields) to something like this

• dataprocessing changes cObj->data
• fields statements then can pick their content
  Needs some more thinking for:
• nested structures like resolved flexforms, how to pick whole chunks or deep nested fields

[tmotyl]

@lukaszuznanski please update the issue - is it still valid?