This reverts commit d8199d8c.

This reverts commit 1ac11c98.

This reverts commit b978c15a.

This patch depends on "input core add status field per elementary stream".

VLC has status reporting on the input state, but not on the output state.
This makes it impossible to know if playback actually started completely from
checking stream status states.

For instance a failed audio output cannot be determined programatically. This
patch adds an extra field per ES (in src/input/es_out.c) to determine the state
of that ES (DISABLE, ENABLED, ERROR).

If CreateDecoder() cannot instantiate an output, then it set p_dec->b_error = true.
This is used to determine what the return value for es_out_GetEsState() should be.
If p_dec->b_error is true, then it returns an ES_OUT_STATE_ES_ERROR to the caller.
Else it returns ES_OUT_STATE_ES_ENABLED or ES_OUT_STATE_ES_DISABLED.

A function 'es_out_GetEsState()' is available to query an input for the state of
the primary audio, video and SPU elementary streams.

Bug introduced in commit 87cd07ca

close #6347

Stop losing extra audio tracks after the first one

```--
  CC       os2/specific.lo
os2/specific.c: In function 'IPCHelperThread':
os2/specific.c:57:5: error: implicit declaration of function 'pl_Get' [-Werror=implicit-function-declaration]
os2/specific.c:57:30: warning: initialization makes pointer from integer without a cast [enabled by default]
cc1: some warnings being treated as errors
```

--
Signed-off-by: Francois Cartegnie <fcvlcdev@free.fr>

```--
  CC       addons/vorepository.lo
addons/vorepository.c: In function 'Close':
addons/vorepository.c:490:9: error: implicit declaration of function 'unlink' [-Werror=implicit-function-declaration]
cc1: some warnings being treated as errors
```

--
Signed-off-by: Francois Cartegnie <fcvlcdev@free.fr>

All our private context end in sys_t
Do the same for elementary stream specific context inside sout modules