[TASK] Update copyright year to 2013

Changes "(c) 2010-2012" to "(c) 2010-2013"

Releases: 6.1
Resolves: #46840
Change-Id: I0a26a9a05cfc5697eb536016aee946ad970d82b3
Reviewed-on: https://review.typo3.org/19494
Reviewed-by: Alexander Schnitzler
Tested-by: Alexander Schnitzler