[FEATURE] Place global Fluid ViewHelper namespaces in TYPO3 configuration

This change moves the default/global namespaces from being stored
directly on the ViewHelperResolver to being stored in the global
TYPO3 configuration array.

This then allows the namespaces to be manipulated as part of the site
configuration, including from within third party ViewHelper packages
which follow TYPO3 extension rules.

Change-Id: Ic324c023b4fbff6ab3e73e651dfca8dfd78453d9
Releases: master
Resolves: #78415
Reviewed-on: https://review.typo3.org/50354


Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>
Reviewed-by: Anja Leichsenring <aleichsenring@ab-softlab.de>
Tested-by: Anja Leichsenring <aleichsenring@ab-softlab.de>