Revert "High-frequency timer does nothing with sleep interval, it turns out"

This reverts commit c6e5a5f449f95a833b826ebfae870a2e519fcfa0.

Actually, it does for Sleep(x) where x > 1 and x < 15, but only for Windows newer than XP.

Next time let's check for ourselves instead of using obsolete info from the 'net...
Undo the filtering clusterfuck following discussion with dbaarda
Workaround camera frame-retrieval badness