ui: Indexing UI

* Added DialogView with QtDialogView implementation to handle information dialogs
* Implemented QtIndexingDialog class that covers all different dialogs for indexing
* Directly communicate with DialogView from Prpject and all Tasks involved in indexing
* Block QtMainWindow UI while indexing

src/lib/Application.h

@@ -12,12 +12,13 @@
 #include "utility/messaging/type/MessageRefresh.h"
 #include "utility/messaging/type/MessageSwitchColorScheme.h"
 
+class DialogView;
 class IDECommunicationController;
-class NetworkFactory;
-class ViewFactory;
 class MainView;
+class NetworkFactory;
 class StorageCache;
 class Version;
+class ViewFactory;
 
 class Application
 	: public MessageListener<MessageActivateWindow>
@@ -63,6 +64,8 @@ private:
 
 	void updateRecentProjects(const FilePath& projectSettingsFilePath);
 
+	DialogView* getDialogView() const;
+
 	const bool m_hasGUI;
 	std::shared_ptr<Project> m_project;
 	std::shared_ptr<StorageCache> m_storageCache;