[TASK] Use name-resolution instead of strings where possible: 16

(part for extensions starting with "d" to "v")

Use name-resolution with ...::class instead of strings where
possible.
(needs PHP 5.5, which is meanwhile required for master)

Change-set Iedbb896607adddce2b23ab67f990fa2296c0d1bb
first introduced usage of ::class in master. We now add it
in various more places.

Change-Id: Idd4dbb32c5e7be1fc566a65cb729a684de003056
Resolves: #63477
Releases: master
Reviewed-on: http://review.typo3.org/34872


Reviewed-by: Andreas Fernandez <a.fernandez@scripting-base.de>
Tested-by: Andreas Fernandez <a.fernandez@scripting-base.de>
Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Tested-by: Wouter Wolters <typo3@wouterwolters.nl>