Rate limit hb_error() messages to at most 1 message per second of the same message. Repeats will be counted and presented as a count when 1 second has elapsed since the first error of a sequence, or an error message with a different string.
Also modified dvdnav to use hb_error() to take advantage of the limiting.
This works around a real bug from dvdnav where the Mac GUI becomes unresponsive during the output of large numbers of errors.
git-svn-id: svn://localhost/HandBrake/trunk@2971
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