Added sound settings page

+ added sound setting page
+ added sound setting icon
+ moved sound settings from interface settings

Added master volume

+ added master volume slider.
+ volume can be changed by sliding bar or by using the spin box
+ Preview of  volume will be played when dragging and releasing bar.

Added checks for qt4

Qt4 does not have support for setting the volume without some lengthy
work around, I have disabled volume control for qt4 users and have
mentioned that "Master volume requires qt5".

Updated sfx

+ removed all old sfx
+ added new end step and tap sound
+ tap/endstep sound has a timer on it to prevent spamming
+ test sound engine will now use endstep sound

Made end step sfx softer

end step felt too harsh

Added player joined sound

+ added a sound for when a new player joins a room

Updated

Was missing a sound when a player joins

Made end step softer

Made end step even softer

updated sound again

cockatrice/src/settingscache.h

@@ -39,6 +39,7 @@ signals:
     void ignoreUnregisteredUsersChanged();
     void ignoreUnregisteredUserMessagesChanged();
     void pixmapCacheSizeChanged(int newSizeInMBs);
+    void masterVolumeChanged(int value);
 private:
     QSettings *settings;
 
@@ -79,6 +80,7 @@ private:
     bool showMessagePopups;
     bool showMentionPopups;
     bool leftJustified;
+    int masterVolume;
 public:
     SettingsCache();
     const QByteArray &getMainWindowGeometry() const { return mainWindowGeometry; }
@@ -134,6 +136,7 @@ public:
     bool getShowMessagePopup() const { return showMessagePopups; }
     bool getShowMentionPopup() const { return showMentionPopups; }
     bool getLeftJustified() const { return leftJustified; }
+    int getMasterVolume() const { return masterVolume; }
 public slots:
     void setMainWindowGeometry(const QByteArray &_mainWindowGeometry);
     void setLang(const QString &_lang);
@@ -182,6 +185,7 @@ public slots:
     void setShowMessagePopups(const int _showMessagePopups);
     void setShowMentionPopups(const int _showMentionPopups);
     void setLeftJustified( const int _leftJustified);
+    void setMasterVolume(const int _masterVolume); 
 };
 
 extern SettingsCache *settingsCache;