ui: implemented gui abstraction and dummy view

- added abstract class tree for gui elements.
- implemented concrete gui classes that wrap the qt specific content.
- implemented first DummyView which plays nice with the ViewManager.

review id = 12

src/app/main.cpp

@@ -2,21 +2,25 @@
 
 #include <QApplication>
 #include <QTextEdit>
+#include <qlayout.h>
+#include <qgroupbox.h>
 
 #include "Application.h"
 #include "includes.h"
+#include "qt/element/QtArea.h"
+#include "qt/element/QtCanvas.h"
 #include "qt/QtElementFactory.h"
+#include "qt/QtWindow.h"
 
 int main(int argv, char **args)
 {
 	QApplication qtApp(argv, args);
 	std::shared_ptr<GuiElementFactory> elementFactory = std::make_shared<QtElementFactory>();
 
-	std::shared_ptr<Application> app = Application::create(elementFactory);
-	app->loadProject();
+	std::shared_ptr<QtWindow> window = std::make_shared<QtWindow>();
 
-	QTextEdit textEdit;
-	textEdit.show();
+	std::shared_ptr<Application> app = Application::create(elementFactory, window);
+	app->loadProject();
 
 	return qtApp.exec();
 }