(cherry picked from commit a2c2c186)

(cherry picked from commit 676a57c2)

(cherry picked from commit 9dded130)

(cherry picked from commit 12981736)

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(cherry picked from commit c7f9f11c)

Send the *_EFFECT_CONTROL_SESSION intent when the state of current media
is updated. It allows external audio effects like equalizer or
visualizer to know the audio session id used by VLC and apply their own
effect.
See android.media.audiofx.AudioEffect.

Signed-off-by: Geoffrey Métais <geoffrey.metais@gmail.com>
(cherry picked from commit 00316e7f)

Generate an audio session id from AudioManager and pass it to libVLC as
a command line argument so that it creates AudioTrack in this session.

Signed-off-by: Geoffrey Métais <geoffrey.metais@gmail.com>
(cherry picked from commit f3316483)

(cherry picked from commit fcb45f49)

(cherry picked from commit 8ebdc390)

Signed-off-by: Geoffrey Métais <geoffrey.metais@gmail.com>

Signed-off-by: Geoffrey Métais <geoffrey.metais@gmail.com>

Signed-off-by: Geoffrey Métais <geoffrey.metais@gmail.com>

Signed-off-by: Geoffrey Métais <geoffrey.metais@gmail.com>

Signed-off-by: Geoffrey Métais <geoffrey.metais@gmail.com>

(cherry picked from commit 3e7196da)

(cherry picked from commit 20dcc21f)

(cherry picked from commit 6750db18)

Signed-off-by: Geoffrey Métais <geoffrey.metais@gmail.com>

Close #518

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