Use Hash table in QGeoTiledMappingManagerEngineQGC

src/QtLocationPlugin/GoogleMapProvider.cpp

src/QtLocationPlugin/GoogleMapProvider.h

src/QtLocationPlugin/MapProvider.cpp

src/QtLocationPlugin/MapProvider.h

src/QtLocationPlugin/QGCMapUrlEngine.cpp

src/QtLocationPlugin/QGCMapUrlEngine.h

src/QtLocationPlugin/QGeoTiledMappingManagerEngineQGC.cpp