[BUGFIX] Introduce own Be/ContainerViewHelper

Currently the ContainerViewHelper of ext:extensionmanager is
used. But in TYPO3 6.2 the viewHelper is removed.

Add a own ContainerViewHelper to ext:media to be compatible
with 6.1 and 6.2.
Added a copy of the new ext:fluid Be/ContainerViewHelper. So when
we raise the TYPO3 version dependency, we can remove this class in
favour of the one from Core.

Fixes: #50602
Releases: 1.1.0
Change-Id: I09386cd56c8775b36577871467d060e079d67a70
Reviewed-on: https://review.typo3.org/22827
Reviewed-by: Fabien Udriot
Tested-by: Fabien Udriot