implement settings, fix bugs and enhance ui

- Added new settings keys in SettingsManager for download path, auto-check updates, auto-raise window, switch to new device, unmount iFuse on exit, theme, and connection timeout.
- Implemented methods to get and set these new settings.
- Updated SettingsWidget to include UI elements for the new settings, including checkboxes and a combo box for theme selection.
- Refactored loadSettings and saveSettings methods to handle new settings.
- Removed deprecated settings UI elements to streamline the interface.
- Introduced VirtualLocation widget for managing virtual location settings with a map interface.
- Integrated QML for map visualization and input handling for latitude and longitude.
- Added functionality to apply virtual location settings to the connected device.

src/virtuallocationwidget.h

@@ -0,0 +1,42 @@
+#ifndef VIRTUAL_LOCATION_H
+#define VIRTUAL_LOCATION_H
+
+#include "iDescriptor.h"
+#include <QLineEdit>
+#include <QPushButton>
+#include <QQuickWidget>
+#include <QTimer>
+#include <QWidget>
+
+class VirtualLocation : public QWidget
+{
+    Q_OBJECT
+
+public:
+    explicit VirtualLocation(iDescriptorDevice *device,
+                             QWidget *parent = nullptr);
+
+signals:
+    void locationChanged(double latitude, double longitude);
+
+public slots:
+    void updateInputsFromMap(double latitude, double longitude);
+
+private slots:
+    void onQuickWidgetStatusChanged(QQuickWidget::Status status);
+    void onInputChanged();
+    void onMapCenterChanged();
+    void onApplyClicked();
+    void updateMapFromInputs();
+
+private:
+    QQuickWidget *m_quickWidget;
+    QLineEdit *m_latitudeEdit;
+    QLineEdit *m_longitudeEdit;
+    QPushButton *m_applyButton;
+    QTimer m_updateTimer;
+    bool m_updatingFromInput = false;
+    iDescriptorDevice *m_device;
+};
+
+#endif // VIRTUAL_LOCATION_H