Remove redundant \since 5.0

\since 5.0 has been add to the class section, so member functions and
properties donot need this any more.

see SHA: 5728c8a8e7

Change-Id: I4e67461373dda99ee1fbfdeb6477fde1dcfec116
Reviewed-by: Casper van Donderen <casper.vandonderen@nokia.com>

src/gui/kernel/qguiapplication.cpp

@@ -478,7 +478,6 @@ QWindow *QGuiApplication::topLevelAt(const QPoint &pos)
 /*!
     \property QGuiApplication::platformName
     \brief The name of the underlying platform plugin.
-    \since 5.0
 */
 
 QString QGuiApplication::platformName()
@@ -1959,8 +1958,6 @@ void QGuiApplication::restoreOverrideCursor()
 #endif// QT_NO_CURSOR
 
 /*!
-  \since 5.0
-
   Returns the application's style hints.
 
   The style hints encapsulate a set of platform dependent properties
@@ -2014,8 +2011,6 @@ QInputMethod *QGuiApplication::inputMethod() const
 }
 
 /*!
-  \since 5.0
-
   returns the input panel.
 
   The input panel returns properties about the state and position of
@@ -2030,7 +2025,6 @@ QInputPanel *QGuiApplication::inputPanel() const
 }
 
 /*!
-    \since 4.5
     \fn void QGuiApplication::fontDatabaseChanged()
 
     This signal is emitted when application fonts are loaded or removed.

src/gui/kernel/qscreen.cpp

@@ -578,7 +578,6 @@ void QScreenPrivate::updatePrimaryOrientation()
 
     \warning In general, grabbing an area outside the screen is not
     safe. This depends on the underlying window system.
-    \since 5.0
 */
 
 QPixmap QScreen::grabWindow(WId window, int x, int y, int w, int h) const

src/gui/kernel/qwindow.cpp

@@ -212,7 +212,6 @@ QWindow::SurfaceType QWindow::surfaceType() const
 /*!
     \property QWindow::visible
     \brief whether the window is visible or not
-    \since 5.0
 
     This property controls the visibility of the window in the windowing system.
 
@@ -484,7 +483,6 @@ Qt::WindowType QWindow::windowType() const
 /*!
     \property QWindow::windowTitle
     \brief the window's title in the windowing system
-    \since 5.0
 
     The window title might appear in the title area of the window decorations,
     depending on the windowing system and the window flags. It might also
@@ -615,7 +613,6 @@ bool QWindow::isActive() const
 
 /*!
     \property QWindow::contentOrientation
-    \since 5.0
     \brief the orientation of the window's contents
 
     This is a hint to the window manager in case it needs to display
@@ -935,25 +932,21 @@ void QWindow::setGeometry(const QRect &rect)
 
 /*!
     \property QWindow::x
-    \since 5.0
     \brief the x position of the window's geometry
 */
 
 /*!
     \property QWindow::y
-    \since 5.0
     \brief the y position of the window's geometry
 */
 
 /*!
     \property QWindow::width
-    \since 5.0
     \brief the width of the window's geometry
 */
 
 /*!
     \property QWindow::height
-    \since 5.0
     \brief the height of the window's geometry
 */