deinterlace: Improve process logic
The logic now works better if we filter orphans, then progressive, then telecine interlaced fields which need to be woven and fall through to interlace. Telecine interlaced fields will be regularly deinterlaced if there is no pattern lock for us to be sure that we have a telecine pattern. Telecine sequences that aren't 24fps progressive with RFF flags can't really be tested until fieldanalysis is ported.
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