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The fluid backend ContainerViewHelper is very similar to the
PageRenderViewHelper, with the exception that container VH
adds a default and empty ModuleTemplate leading to a default
and thus pretty useless docheader.

The main ModuleTemplate logic of backend modules should
be done within controllers and resource registration like
CSS can be done with PageRenderer VH.

The patch deprecates the ContainerViewHelper.

Resolves: #94225
Releases: master
Change-Id: I69f06313f7ba1d647b702572e58eed1394dd1f2c
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/69312

Tested-by: core-ci <typo3@b13.com>
Tested-by: Anja Leichsenring <aleichsenring@ab-softlab.de>
Tested-by: Oliver Bartsch <bo@cedev.de>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>
Reviewed-by: Anja Leichsenring <aleichsenring@ab-softlab.de>
Reviewed-by: Oliver Bartsch <bo@cedev.de>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>