libavfilter yadif framerate, automatic deinterlace and automatic scaler fix #216
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This patch improves yadif deinterlacer's handling in XBMC. With the patch, output framerate is only doubled if yadif is actually engaged: when the user explicitly selects deinterlace or selects automatic and the video flags tell the video is interlaced.
The patch also fixes automatic HQ scalers on Windows. This is achieved by checking for changed video fps and forces reinitialization of the renderer. To react quickly, video fps calculation will be reset everytime when yadif is enabled/disabled.
Comments welcome. :)