[FEATURE] Add file collection support

This patch provides file collection support in DCE.

Resolves: #61076
Change-Id: I9a7b83e0dc7c6a1cad2feea2efede90a14efe9ff
Reviewed-on: http://review.typo3.org/32249
Reviewed-by: Armin Ruediger Vieweg <armin@v.ieweg.de>
Tested-by: Armin Ruediger Vieweg <armin@v.ieweg.de>