[SECURITY] Prohibit accessing storage 0 from backend UI

Manually accessing backend entry-points regarding files passing
an identifier with storage 0 may allow unfiltered access for read,
write, rename, create and delete actions.

The user interface must never deal with storage 0. Therefore
implement checks for storage 0 as protection.

Change-Id: Ia387dfac3057760800171163ff91cd9f55cab4b5
Releases: 6.2, 6.1, 6.0
Fixes: #50886
Security-Commit: b813a875ad76aa7860b76602eb1f32dcfc9fadcd
Security-Bulletin: TYPO3-CORE-SA-2013-003
Reviewed-on: https://review.typo3.org/23608
Reviewed-by: Oliver Hader
Tested-by: Oliver Hader