Doc: Various fixes to Qt Audio Engine documentation

-fixed \since to "\since 5.0" (Qt version 5.0)
-made a \qmlmodule page so the list of related classes are automatically
 listed
-made changes in the Qt Multimedia documentation to link to the
 Qt Audio Engine documentation

Change-Id: Ibdd3da02871648988a73172934e684840c4ce0ae
Reviewed-by: Yoann Lopes <yoann.lopes@digia.com>

src/imports/audioengine/qdeclarative_attenuationmodel_p.cpp

@@ -92,9 +92,9 @@ void QDeclarativeAttenuationModel::setName(const QString& name)
 /*!
     \qmltype AttenuationModelLinear
     \instantiates QDeclarativeAttenuationModelLinear
-    \since 1.0
+    \since 5.0
     \brief Defines a linear attenuation curve for a \l Sound.
-    \inqmlmodule QtAudioEngine 1.0
+    \inqmlmodule QtAudioEngine
     \ingroup multimedia_audioengine
     \inherits Item
     \preliminary
@@ -225,9 +225,9 @@ qreal QDeclarativeAttenuationModelLinear::calculateGain(const QVector3D &listene
     \qmltype AttenuationModelInverse
     \instantiates QDeclarativeAttenuationModelInverse
 
-    \since 1.0
+    \since 5.0
     \brief Defines a non-linear attenuation curve for a \l Sound.
-    \inqmlmodule QtAudioEngine 1.0
+    \inqmlmodule QtAudioEngine
     \ingroup multimedia_audioengine
     \inherits Item
     \preliminary

src/imports/audioengine/qdeclarative_audiocategory_p.cpp

@@ -49,9 +49,9 @@ QT_USE_NAMESPACE
 /*!
     \qmltype AudioCategory
     \instantiates QDeclarativeAudioCategory
-    \since 1.0
+    \since 5.0
     \brief Control all active sound instances by group.
-    \inqmlmodule QtAudioEngine 1.0
+    \inqmlmodule QtAudioEngine
     \ingroup multimedia_audioengine
     \inherits Item
     \preliminary

src/imports/audioengine/qdeclarative_audioengine_p.cpp

@@ -58,9 +58,9 @@ QT_BEGIN_NAMESPACE
 /*!
     \qmltype AudioEngine
     \instantiates QDeclarativeAudioEngine
-    \since 1.0
+    \since 5.0
     \brief Organize all your 3d audio content in one place.
-    \inqmlmodule QtAudioEngine 1.0
+    \inqmlmodule QtAudioEngine
     \ingroup multimedia_audioengine
     \inherits Item
     \preliminary

src/imports/audioengine/qdeclarative_audiolistener_p.cpp

@@ -50,9 +50,9 @@ QT_USE_NAMESPACE
 /*!
     \qmltype AudioListener
     \instantiates QDeclarativeAudioListener
-    \since 1.0
+    \since 5.0
     \brief Control global listener parameters.
-    \inqmlmodule QtAudioEngine 1.0
+    \inqmlmodule QtAudioEngine
     \ingroup multimedia_audioengine
     \inherits Item
     \preliminary

src/imports/audioengine/qdeclarative_audiosample_p.cpp

@@ -52,9 +52,9 @@ QT_USE_NAMESPACE
 /*!
     \qmltype AudioSample
     \instantiates QDeclarativeAudioSample
-    \since 1.0
+    \since 5.0
     \brief Load audio samples, mostly .wav.
-    \inqmlmodule QtAudioEngine 1.0
+    \inqmlmodule QtAudioEngine
     \ingroup multimedia_audioengine
     \inherits Item
     \preliminary

src/imports/audioengine/qdeclarative_playvariation_p.cpp

@@ -51,12 +51,12 @@ QT_USE_NAMESPACE
 /*!
     \qmltype PlayVariation
     \instantiates QDeclarativePlayVariation
-    \since 1.0
+    \since 5.0
     \brief Define a playback variation for \l {Sound} {sounds}.
     So each time the playback of the same sound can be a slightly different even with the same
     AudioSample.
 
-    \inqmlmodule QtAudioEngine 1.0
+    \inqmlmodule QtAudioEngine
     \ingroup multimedia_audioengine
     \inherits Item
     \preliminary

src/imports/audioengine/qdeclarative_sound_p.cpp

@@ -140,10 +140,10 @@ void QDeclarativeSoundCone::componentComplete()
 /*!
     \qmltype Sound
     \instantiates QDeclarativeSound
-    \since 1.0
+    \since 5.0
     \brief Define a variety of samples and parameters to be used for
     SoundInstance.
-    \inqmlmodule QtAudioEngine 1.0
+    \inqmlmodule QtAudioEngine
     \ingroup multimedia_audioengine
     \inherits Item
     \preliminary

src/imports/audioengine/qdeclarative_soundinstance_p.cpp

@@ -53,9 +53,9 @@ QT_USE_NAMESPACE
 /*!
     \qmltype SoundInstance
     \instantiates QDeclarativeSoundInstance
-    \since 1.0
+    \since 5.0
     \brief Play 3d audio content.
-    \inqmlmodule QtAudioEngine 1.0
+    \inqmlmodule QtAudioEngine
     \ingroup multimedia_audioengine
     \inherits Item
     \preliminary