Major Controller refactor (#2295)

* Change Controller interface to mimic the CLI

Signed-off-by: Haris Gušić <harisgusic.dev@gmail.com>

* Remove obsolete handleCaptureTaken

Signed-off-by: Haris Gušić <harisgusic.dev@gmail.com>

* Extract system tray icon into separate class

The implementation is not complete and full of bugs

Signed-off-by: Haris Gušić <harisgusic.dev@gmail.com>

* Remove Controller::handleCaptureFailed

Signed-off-by: Haris Gušić <harisgusic.dev@gmail.com>

* Fix a QObject connection

Signed-off-by: Haris Gušić <harisgusic.dev@gmail.com>

* Controller: remove unused includes

Signed-off-by: Haris Gušić <harisgusic.dev@gmail.com>

* Make check for updates work again

Signed-off-by: Haris Gušić <harisgusic.dev@gmail.com>

* Move functionality to daemon and tray icon

Signed-off-by: Haris Gušić <harisgusic.dev@gmail.com>

* Rename SystemTray to TrayIcon

Signed-off-by: Haris Gušić <harisgusic.dev@gmail.com>

* Add missing trayicon.* files

Signed-off-by: Haris Gušić <harisgusic.dev@gmail.com>

* Add missing QDesktopWidget

Signed-off-by: Haris Gušić <harisgusic.dev@gmail.com>

* Fix syntax errors

Signed-off-by: Haris Gušić <harisgusic.dev@gmail.com>

* Add missing include

Signed-off-by: Haris Gušić <harisgusic.dev@gmail.com>

* Include missing QOperatingSystemVersion on Mac

Signed-off-by: Haris Gušić <harisgusic.dev@gmail.com>

* Move update checking to daemon

Signed-off-by: Haris Gušić <harisgusic.dev@gmail.com>

* Remove obsolete method Controller::doLater

Signed-off-by: Haris Gušić <harisgusic.dev@gmail.com>

* Some cleanup

Signed-off-by: Haris Gušić <harisgusic.dev@gmail.com>

* Rename Controller to Flameshot

Signed-off-by: Haris Gušić <harisgusic.dev@gmail.com>

* Final touches

Signed-off-by: Haris Gušić <harisgusic.dev@gmail.com>

src/utils/systemnotification.cpp

@@ -1,5 +1,5 @@
 #include "systemnotification.h"
-#include "src/core/controller.h"
+#include "src/core/flameshot.h"
 #include "src/utils/confighandler.h"
 #include <QApplication>
 #include <QUrl>
@@ -8,6 +8,8 @@
 #include <QDBusConnection>
 #include <QDBusInterface>
 #include <QDBusMessage>
+#else
+#include "src/core/flameshotdaemon.h"
 #endif
 
 SystemNotification::SystemNotification(QObject* parent)
@@ -44,8 +46,10 @@ void SystemNotification::sendMessage(const QString& text,
       this,
       [&]() {
           // The call is queued to avoid recursive static initialization of
-          // Controller and ConfigHandler.
-          Controller::getInstance()->sendTrayNotification(text, title, timeout);
+          // Flameshot and ConfigHandler.
+          if (FlameshotDaemon::instance())
+              FlameshotDaemon::instance()->sendTrayNotification(
+                text, title, timeout);
       },
       Qt::QueuedConnection);
 #else