qdoc: Rename transmogrify() and move it under Utilities namespace

The transmogrify() function was used by the Generator to produce
clean output file names by replacing all non-alphanum characters
with hyphens. This function is useful elsewhere as well,
especially in HTMLGenerator, as it produces valid strings for use
as HTML attribute values.

Rename the function to a more descriptive canonicalizeFileName(),
move it to the Utilities namespace, improve its documentation and
touch up the implementation a bit; make it return a QString
instead of modifying a string passed as an argument.

Pick-to: 6.5
Change-Id: I6088f4603802b86f96c4a5b668668ef229b302f3
Reviewed-by: Luca Di Sera <luca.disera@qt.io>

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