Replace the stub AvPlayer export set with a general-purpose player state
machine covering the full API surface: sceAvPlayerInit/InitEx/PostInit,
AddSource/AddSourceEx, Start/StartEx, Pause/Resume/Stop/Close, IsActive,
CurrentTime, JumpToTime, SetLooping, SetAvSyncMode, SetTrickSpeed,
SetAvailableBandwidth, StreamCount/EnableStream/DisableStream/ChangeStream/
GetStreamInfo(Ex), and GetVideoData(Ex)/GetAudioData.
No real decoder is wired up: the player tracks lifecycle and timing state
and serves a fixed-length blank clip on a wall-clock media clock, firing
the READY/PLAY/PAUSE/STOP event callbacks a title expects from a real
playback session. This is enough for titles that gate progression on
AvPlayer's polling/event surface rather than on decoded frame content.
The non-native libSceAvPlayer/Export.cpp now forwards to the native
implementation via #include rather than carrying its own duplicate stub
definitions, consistent with how other libSceX/libSceX.native pairs in
this tree share one implementation.
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