when os weight os width value are set use them when adding a font to a ds

[typemytype]

if the axes Weight or Width exits use the os weight and os width value from the font info

@frankrolf

[LettError]

Would be useful. What is the expectation when the value already exists?

[typemytype]

proposal is to use them as initial values, they are set deliberately. Now DSE sets all added fonts to the neutral.