vo_lavc: explicitly skip redraw and repeated frames

The user won't want to have those in the video (I think). The core can
sporadically issue redraws, which is what you want for actual playback,
but not in encode mode. vo_lavc can explicitly detect those and skip
them. It only requires switching to a more advanced internal VO API.

The comments in vo.h are because vo_lavc draws to one of the images in
order to render OSD. This is OK, but might come as a surprise to whoever
calls draw_frame, so document it. (Current callers are OK with it.)

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