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Allow to enable OOUI via a parser tag extension

Description

Allow to enable OOUI via a parser tag extension

This change adds the possibility to enable OOUI out of the parser,
which enabled parser tag functions to easily enable OOUI, if they
need it, for every page view out of the function that handles the
parser tag.

Bug: T106949
Change-Id: If1e139d4f07be98e418e11470794ea42e8a9b2eb