Automatically load settings

This waits until the ground station IP address is discovered, then
immediately loads settings so they are available soon after launch.

Then it keeps them updated every 60 seconds.

qml/ui/SettingsPopup.qml

@@ -19,6 +19,29 @@ SettingsPopupForm {
      *
      */
 
+
+    property double lastSettingsLoad: 0
+
+    Timer {
+        interval: 1000;
+        running: true;
+        repeat: true
+        onTriggered: {
+            if (!openHDSettings.ground_available) {
+                return;
+            }
+
+            var currentTime = (new Date).getTime();
+            if (currentTime - lastSettingsLoad > 60000) {
+                if (!settings_popup.opened) {
+                    lastSettingsLoad = currentTime;
+                    console.log("Settings panel not open, triggering load");
+                    openHDSettings.fetchSettings();
+                }
+            }
+        }
+    }
+
     ListModel {
         dynamicRoles: true
         id: generalSettingsModel