Fix a number of other qdoc issues.

* Several places needed the forward class declaration hack
* Missing/wrong minor version numbers on imports
* A few typos
* Any number of attempts to work around qdoc
* A few missing docs
* Tweaked soundeffect docs

Change-Id: I3c2ab998a11cbb0956712e0423e01fdb70f5bfff
Reviewed-by: Peter Yard <peter.yard@nokia.com>
Reviewed-by: Angus Cummings <angus.cummings@nokia.com>
Reviewed-by: Jonas Rabbe <jonas.rabbe@gmail.com>

src/imports/audioengine/qdeclarative_sound_p.cpp

@@ -139,10 +139,10 @@ void QDeclarativeSoundCone::componentComplete()
 ////////////////////////////////////////////////////////////
 /*!
     \qmlclass Sound QDeclarativeSound
-    \since 5.0
+    \since 1.0
     \brief Define a variety of samples and parameters to be used for
     SoundInstance.
-    \inqmlmodule QtAudioEngine 1
+    \inqmlmodule QtAudioEngine 1.0
     \ingroup multimedia_audioengine
     \inherits Item
     \preliminary