Partially revert 30f9eb49

* remove unneded p_sys variables (p_xml)
* fix memleaks.
* fix object leaks.

seems that noone is using it actually).

Only blu-ray subtitle are enabled.
If other formats are to be enabled, they must be carefully tested.

It will be used for blu-ray subtitles.

This solves the Sony Wave float32 sample on little endian machines.
Of course the float64 sample doesn't work yet, because of the lack of converter.

(or maybe it was Aesthetics)

This sets the fmt.i_bitrate value and fixes decoding of TwinVQ samples. Thanks a lot to Vitor for pointing where the error was.