ff_audio_decoder: fix multichannel playback

* Observe channel configuration immediately after av_decode_audio* ().
    Do not try to access nonexistant channels after a 5.1 -> 2.0 switch
    for example.

* Add NULL plane pointer paranoia.

* Assume generic channel layout when no detailled one provided.
    Needed for wma2.

* Follow user speaker arrangement changes on the fly.

* Defer opening audio out until we have something to play.

* Do not reopen audio out with identical settings. This and the
    previous item should help avoiding waiting on some drivers.

* Hard wire output to int16_t. Some of the code did assume that,
    and we are converting to that anyway.

* Do not read sample format from bits_per_coded_sample. Decoders
    neither alter that field, nor do they force its value to their
    output.

* Rename some vars for better readability.

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