[MPlayer-dev-eng] Change pts values to use doubles instead of floats

[Uoti Urpala]

Floats do not have sufficient precision to hold pts values in long
streams/files. After 8192 seconds the distance between two consecutive
floats is about 1 ms, and the error grows proportional to file length,
so after 65536 seconds (less than a day) it's 8 ms.

The attached patch changes the common data structures to doubles. It
does not yet change any demuxers to produce pts values with higher
precision, many of them use floats internally.
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