avfilter/tinterlace: Properly preserve CEA-708 closed captions

Because the interlacing filter halves the effective framerate, we
need to ensure that no CEA-708 data is lost as frames are merged.

Make use of the new ccfifo mechanism to ensure that caption data
is properly preserved as frames pass through the filter.

Thanks to Thomas Mundt for review and noticing a couple of
missed codepaths for injection on output.  Thanks to Lance Wang
for pointing out a memory leak.

Signed-off-by: Devin Heitmueller <dheitmueller@ltnglobal.com>
Signed-off-by: Limin Wang <lance.lmwang@gmail.com>

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