[FEATURE] adds a Form Element that uses TYPO3.Form Yaml Files

Via selecting a valid form identifier in the inspecter a TYPO3.Form
Yaml Setting File can be rendered.

Change-Id: I565354f47d98cf5446991fe5ae57b4e9194e804d
Reviewed-on: https://review.typo3.org/24345
Reviewed-by: Christoph Dähne
Tested-by: Christoph Dähne
Tested-by: Sebastian Helzle
Reviewed-by: Sebastian Kurfuerst
Tested-by: Sebastian Kurfuerst
Merge remote-tracking branch 'origin/master'