Add option to disable system tray integration

Implements #59

imports/NeoChat/Page/SettingsPage.qml

@@ -16,6 +16,15 @@ Kirigami.ScrollablePage {
     title: i18n("Settings")
 
     Kirigami.FormLayout {
+        QQC2.CheckBox {
+            Kirigami.FormData.label: i18nc("General settings:")
+            text: i18n("Close to sytem tray")
+            checked: Config.systemTray
+            onToggled: {
+                Config.systemTray = checked
+                Config.save()
+            }
+        }
         QQC2.CheckBox {
             // TODO: When there are enough notification and timeline event
             // settings, make 2 separate groups with FormData labels.

src/controller.cpp

@@ -55,15 +55,26 @@
 Controller::Controller(QObject *parent)
     : QObject(parent)
 {
-    QApplication::setQuitOnLastWindowClosed(false);
-
     Connection::setRoomType<NeoChatRoom>();
     Connection::setUserType<NeoChatUser>();
 
 #ifndef Q_OS_ANDROID
     TrayIcon *trayIcon = new TrayIcon(this);
-    trayIcon->show();
+    if(NeoChatConfig::self()->systemTray()) {
-    connect(trayIcon, &TrayIcon::showWindow, this, &Controller::showWindow);
+        trayIcon->show();
+        connect(trayIcon, &TrayIcon::showWindow, this, &Controller::showWindow);
+        QApplication::setQuitOnLastWindowClosed(false);
+    }
+    connect(NeoChatConfig::self(), &NeoChatConfig::SystemTrayChanged, this, [=](){
+        if(NeoChatConfig::self()->systemTray()) {
+            trayIcon->show();
+            connect(trayIcon, &TrayIcon::showWindow, this, &Controller::showWindow);
+        } else {
+            trayIcon->hide();
+            disconnect(trayIcon, &TrayIcon::showWindow, this, &Controller::showWindow);
+        }
+        QApplication::setQuitOnLastWindowClosed(!NeoChatConfig::self()->systemTray());
+    });
 #endif
 
     QTimer::singleShot(0, this, [=] {

src/neochatconfig.kcfg

@@ -40,6 +40,10 @@
       <label>Show avatar update events in the timeline</label>
       <default>true</default>
     </entry>
+    <entry name="SystemTray" type="bool">
+      <label>Close NeoChat to system tray</label>
+      <default>true</default>
+    </entry>
   </group>
 </kcfg>