[SECURITY] XSS in be_layout wizard

Usage of unverified input parameters in wizard URL leads to a possible
XSS vulnerability in backend_layout wizard.
The solution is the introduction of a hmac validation of the parameters
used in JavaScript.

Change-Id: I48f89309fc062d132e283d4fd9179ccbfdcfda4c
Fixes: #36768
Releases: 6.2, 6.1, 6.0, 4.7, 4.5
Security-Commit: a3ac48f5d66c566d241295d87cc8d7eb4d10c274
Security-Bulletin: TYPO3-CORE-SA-2013-004
Reviewed-on: https://review.typo3.org/26219
Reviewed-by: Oliver Hader
Tested-by: Oliver Hader