The caller will need to specify the icon height and width when providing
their own custom icon image. Add optional parameters to
`.add_ole_object()` suitable for that purpose and update the
documentation.

#748

At least one autoshape name ('"No" Symbol') contains the double-quote
character which raises an XML exception when it prematurely terminates
the `name="..."` attribute of the autoshape. Escape autoshape basename
to avoid this problem, specifically targetting the double-quote
character.

The `make upload` operation doesn't work anymore, so we need to use
twine instead. This calls for a few modernizations to the distribution
configuration and procedure.

Remove <=9.5.0 constraint which was where `font.getsize()` was removed.
That version has one or more security vulnerabilities not fixed until
10+.