Modernizing `quadprog` for convex quadratic programming

[fxm]

I’m all for stdlib becoming a complete scientific toolbox, given that Fortran is so heavily used in science. I’m currently stretched a little thin, but I’ve been meaning to (and still plan to) dive a little deeper into stdlib, to understand how it works, and to see if/how I could contribute. Would love nothing more than to have a single lib as a toolbox for all regular analyses (i.e. everything I don’t need specialised models for). It would also make it less complicated to re-introduce it to university classrooms for a number of reasons.