On case sensitive file systems the SUViewHelper
cannot be found, as the file is named SUViewHelper.php
and the class SuViewHelper.

Rename both file and class to match and to be more
speaking.

Resolves: #42826
Releases: 6.0

Change-Id: I19c0b7c39b77ba2d7b192a989e5d45b2b7d4a2c7
Reviewed-on: http://review.typo3.org/16366
Reviewed-by: Helmut Hummel
Tested-by: Helmut Hummel