Added 5.4.0 change file.

Change-Id: I623b42d5f4f565ee7cf2d064e52609a99636bd6a
Reviewed-by: Jani Heikkinen <jani.heikkinen@theqtcompany.com>

dist/changes-5.4.0

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+Qt 5.4 introduces many new features and improvements as well as bugfixes
+over the 5.3.x series. For more details, refer to the online documentation
+included in this distribution. The documentation is also available online:
+
+  http://qt-project.org/doc/qt-5.4
+
+The Qt version 5.4 series is binary compatible with the 5.3.x series.
+Applications compiled for 5.3 will continue to run with 5.4.
+
+Some of the changes listed in this file include issue tracking numbers
+corresponding to tasks in the Qt Bug Tracker:
+
+  http://bugreports.qt-project.org/
+
+Each of these identifiers can be entered in the bug tracker to obtain more
+information about a particular change.
+
+****************************************************************************
+*                        Important Behavior Changes                        *
+****************************************************************************
+
+ - Using QAudioOutput and QSoundEffect with the PulseAudio backend won't
+   cause the system volume to be automatically changed to the maximum value
+   anymore. Audio streams will now respect the system-wide volume unless
+   explicitly set with setVolume().
+ - On Linux, both Alsa and PulseAudio backends are now present. PulseAudio
+   is used by default if available on the system and if the server is
+   running, otherwise Alsa is used instead.
+
+****************************************************************************
+*                          Library                                         *
+****************************************************************************
+
+QtMultimedia
+------------
+
+ - Added new QAbstractPlanarVideoBuffer class.
+
+ - Camera (QML):
+   * Added deviceId, displayName, position, orientation, metadata,
+     viewfinder.resolution, viewfinder.minimumFrameRate and
+     viewfinder.maximumFrameRate properties.
+   * Camera device can be selected by setting the deviceId or position
+     properties.
+   *
+
+ - QtMultimedia global QML object:
+   * Added defaultCamera and availableCameras properties.
+
+ - QAbstractVideoBuffer:
+   * Added mapPlanes() function.
+
+ - QVideoFrame:
+   * Added support for planar video formats. New planeCount(),
+     bytesPerLine(int plane) and bits(int plane) functions.
+
+ - [QTBUG-40515] Improved PLS parser. It is now more permissive, allowing
+   to load virtually any kind of PLS file. It also correctly resolve
+   relative paths.
+
+****************************************************************************
+*                      Platform Specific Changes                           *
+****************************************************************************
+
+Android
+-------
+
+ - Changing a media player's position after reaching the end of a media
+   now correctly works.
+ - [QTBUG-40314] Fixed playing a QMediaPlaylit with a QMediaPlayer.
+
+Linux
+-----
+
+ - Added support for QCameraInfo::position() and QCameraInfo::orientation().
+ - Added support for QCameraFocus::customFocusPoint.
+ - QMediaRecorder::duration() now returns the correct value when recording
+   with a camera source.
+ - QMediaMetaData::ContributingArtist and QMediaMetaData::AlbumArtist
+   now map to the correct metadata.
+ - Fixed QMediaPlayer's metaDataAvailableChanged() signal, which was never
+   emitted.
+
+OS X
+----
+
+ - OS X 10.6 not being supported anymore, the QuickTime backend has been
+   removed.
+
+QNX
+---
+
+ - [QTBUG-40746] Fixed crash when detroying a QML VideoOutput or Video item.
+
+Windows
+-------
+
+ - [QTBUG-32481] Fixed various memory leaks when using a media player.
+ - [QTBUG-39980] Fixed crash occasionally happening when playing and
+   stopping repeatedly a media with QMediaPlayer.
+ - [QTBUG-40954] Buffers retrieved with QAudioProbe now have a correct
+   startTime().
+ - [QTBUG-41158] Fixed crash occasionally happening when destroying a
+   QML MediaPlayer.
+
+WinRT
+-----
+
+ - Enabled media player support for WinRT.
+ - Enabled basic camera support for WinRT (viewfinder, still image capture
+   and camera device selection).