sub: move --sub-fix-timing handling to renderer

Instead of messing with the subtitle packet timestamps, do it on output.
We work on the libass event list. If there is an unwanted gap or
overlap, we render the timestamp at another position where there is no
gap or overlap.

This is somewhat more robust, and even works with demuxed subs (to some
degree - depends whether the subs are prefected soon enough).

It's active even for native ASS subs. I wonder if this is a problem with
extended type setting. If it is, the heuristic that tries to avoid
interrupting such cases has to be improved.

While it probably would be ideal to do this after the subtitle decoder,
certain aspects are at least currently handled better in this place.

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