[TASK] Adjust to acl changes in Flow
Adjusts the ``security.ifAccess`` ViewHelper to the recent refactoring
of the Security Framework in TYPO3.Flow.
Namely the argument "resource" has been renamed to "privilegeTarget".
This change also provides a code migration that should adjust affected
Fluid templates. Make sure to run::
in order to apply those changes.
Releases: master, 2.3