Fix string conversion from Qt to use UTF8
Fix event loop compilation issues wxQT Android

 * Proper guard GetEventLoopSourcesManager
 * Implement wxAppTraits::GetEventLoopSourcesManager (not only wxGUIAppTraits) if console event loop is disabled
 * Remove unused apptbase.h in wxQT (it is using the unix version)
 * Minor fix to headings in android setup.h (BTW, is that file used at all?)