Add webapp-container mode

if --webapp-container is enabled, no ui but the loading animation will be displayed.

src/contents/ui/webbrowser.qml

@@ -147,8 +147,14 @@ Kirigami.ApplicationWindow {
 
         Navigation {
             id: navigation
+            visible: !webappcontainer
 
-            height: Kirigami.Units.gridUnit * 3
+            height: {
+                if (!webappcontainer)
+                    return Kirigami.Units.gridUnit * 3
+                else
+                    return 0
+            }
 
             anchors {
                 top: parent.top

src/main.cpp

@@ -22,6 +22,7 @@ Q_DECL_EXPORT int main(int argc, char *argv[])
     QCommandLineParser parser;
     QCommandLineOption helpOption = parser.addHelpOption();
     parser.addPositionalArgument("url", "An url to open", "[url]");
+    parser.addOption({"webapp-container", "Start without ui"});
     parser.parse(QGuiApplication::arguments());
 
     // QML loading
@@ -34,6 +35,8 @@ Q_DECL_EXPORT int main(int argc, char *argv[])
         initialUrl = QUrl::fromUserInput(parser.positionalArguments()[0].toUtf8()).toEncoded();
     engine.rootContext()->setContextProperty("initialUrl", initialUrl);
 
+    engine.rootContext()->setContextProperty("webappcontainer", parser.isSet("webapp-container"));
+
     // Browser managger
     AngelFish::BrowserManager *browserManager = new AngelFish::BrowserManager(engine.rootContext());
     engine.rootContext()->setContextProperty("browserManager", browserManager);