[SECURITY] HTML5 support in RemoveXSS

Add support for HTML5 tags and attributes in RemoveXSS.

Change-Id: I4c51967b213b9bfe532887767a9b1cdcb182e9d7
Fixes: #37127
Releases: 6.0, 4.7, 4.6, 4.5
Security-Commit: 6ad77fddb6e264cd2ef763446c79a30a6cee0a2a
Security-Bulletin: TYPO3-CORE-SA-2012-004
Reviewed-on: http://review.typo3.org/13769
Reviewed-by: Oliver Hader
Tested-by: Oliver Hader