[FEATURE] add formhandler support

Resolves: #57513
Releases: 6.2
Change-Id: I01659f92e918120d01bae43f1221cf5d04356d75
Reviewed-on: http://review.typo3.org/32958
Reviewed-by: Ralf Zimmermann <ralf.zimmermann@tritum.de>
Tested-by: Ralf Zimmermann <ralf.zimmermann@tritum.de>