CDDA: more debug on CDDB failures
macosx: add a11y option to increase playlist table font size

Dimensions match the iTunes counter-part setting
Erase regularily the already played directsound buffer outside of the play callback

Since Directsound is unable to detect an underrun while looping, this might be the simplest solution to avoid audio glitches when the audio track finishes before the other es tracks.

It may look overkill but this properly fix #11145 once and for all.