Fix chasm between Symbian and Maemo (auto)-rotation handing

right now, Maemo5 and Symbian have different approaches to handle auto-rotation:

For Maemo5, see http://doc.qt.nokia.com/qt-maemo-4.6/maemo5-rotation.html. The auto-rotation must be requested explicitly, by means of setting WA_Maemo5AutoOrientation, or WA_Maemo5LandscapeOrientation and WA_Maemo5PortraitOrientation respectively. Default is landscape mode.

For Symbian, there is no such API at all. Instead, the device does auto-rotation, which can only be disabled by means of native code. The following is from http://discussion.forum.nokia.com/forum/showthread.php?196776-moved-Disable-auto-rotate-of-a-Qt-C-S60-application&p=719047 :

#ifdef Q_OS_SYMBIAN
// For "lock orientation" below
#include <AknAppUi.h>
// Need libs avkon cone eiksrv
#endif

int main(int argc, char *argv[]) {
    QApplication a(argc, argv);

#ifdef Q_OS_SYMBIAN
    // lock orientation
    CAknAppUi* appUi = dynamic_cast<CAknAppUi*>(CEikonEnv::Static()->AppUi());
    if(appUi){
        QT_TRAP_THROWING(appUi ->SetOrientationL(CAknAppUi::EAppUiOrientationLandscape));
    }
#endif
...

Using native code however is not an option with the Nokia Qt SDK, which does not gurantee native APIs to be available to the developers. Therefore, I propose the following fix to be introduced asap:

1. Alias WA_Maemo5AutoOrientation, etc to WA_AutoOrientation, etc (without "Maemo5") and deprecate the former.
2. Make the flags work on Symbian using the native API.