Feature: #78415 - Global Fluid ViewHelper namespaces moved to TYPO3 configuration

See forge#78415

Description

By storing Fluid's namespaces in $GLOBALS['TYPO3_CONF_VARS']['SYS']['fluid']['namespaces'] we can allow adding or extending the global namespaces from third party packages in for example ext_localconf.php or by simply specifying the namespace arrays in LocalConfiguration.php.

In terms of performance there is nearly zero impact but in terms of flexibility this should provide the ultimate way to manage global namespaces as configuration; something that currently is only possible by implementing custom ViewHelperResolvers.

Impact

  • Site administrators and third party ViewHelper packages will be able to manipulate the global namespace f: in configuration
  • Third party ViewHelper packages will be able to register new global namespaces
  • Template developers can use such global namespaces without first importing them and can use them in all Fluid templates regardless of context.