remove unused declarative MapThemeManager::mapThemes()
remove unused declarative MapTheme
remove declarative Search::m_delegateParent

* m_declarativeSearch and m_marbleWidget are set to the same declarative MarbleWidget
instantiate Bookmarks, Navigation, Routing, Search and Tracking in QML rather than in C++
port declarative widget to MarbleMap; FIXME: no input handling yet
PinchArea: pinch to zoom + pinch to rotate
MouseArea: panning with left mouse button and zooming with middle mouse button
disable PinchArea
remove PinchArea.enabled
qCeil