Do not unload plugins in PluginManager dtor.
According to qt documentation this is not needed. Not unloading plugins avoids timing issues at destruction time: Plugin related instances can be deleted after the deletion of MarbleModel now. Previously MarbleModel deleted the PluginManager, which unloaded the plugins and then created dangling pointers for plugin related instances not cleaned up at that time. Should be backported to the KDE/4.8 branch after testing. CCBUG: 274558 CCBUG: 288542
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