[FEATURE] Allow unit string as viewhelper argument

The ByteViewHelper accepts a parameter 'units' in order to provide
a custom collection of units.

Resolves: #77336
Releases: master
Change-Id: I58a6609eb1d1c8eba1e2610430c20c576481488b
Reviewed-on: https://review.typo3.org/49289


Reviewed-by: Sebastian Bumann <bumann.sebastian@gmail.com>
Tested-by: Sebastian Bumann <bumann.sebastian@gmail.com>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>