[FEATURE] Make "base" of stdWrap_bytes configurable

It is possible now to set the base parameter via TypoScript to define
a base (1000 or 1024) to calculate with if you add custom labels for file
sizes. This allows proper handling of KB/KiB etc.

Resolves: #68756
Releases: master
Change-Id: I345d4584117ac83cd9d49f0ecda0dc2f686ac7ed
Reviewed-on: http://review.typo3.org/42274


Reviewed-by: Andreas Wolf <andreas.wolf@typo3.org>
Tested-by: Andreas Wolf <andreas.wolf@typo3.org>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>