launcher : move call to ShowSplashScreen and BackgroundInitialization to PreStart()
It doesn't change behaviour of launcher in beremiz, but may have some impact on some customizations.
Some customizations need to squeeze some bitmap folder init in between app creation and ShowSplashScreen
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<xhtml:p><![CDATA[This example shows interaction of PLC program with Nintendo Wii Remote controller.
To work this example requires python-cwiid library to be installed.]]></xhtml:p>
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