[Dillo-dev] experimental patch: allow alt text to wrap

Just tried this, and I like the results quite a bit. - "simple" insofar as it doesn't bother with the letter-spacing and font-variant code. - it's a separate path from drawText() because this many-argument version of fl_draw() in fl_draw.cxx is rather a long function so that it can deal with wrapping and images and symbols and all kinds of alignment in general. - if the wrapped text fits into the box, we do some unnecessary clipping. Would it be worth the trouble to add an interface to get fl_measure() information?