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[TASK] Reimplement `TitleTagViewHelper`
Reimplements a ViewHelper to set the page title which can be used by other extensions for EXT:cart.
The implementation is copied from
EXT:sf_event_mgt.
Compared to an implementation without a ViewHelper
(the title could also be set within the controller) this
approach enables other integrators to easily adapt
the page title by simply adding another value to the
argument pageTitle.
This is a preparation for https://github.com/extcode/cart_products/issues/132
Fixes #480