ui: Refactored QtCodeSnippet and added view settings to ApplicationSettings

This change refactors parts of the QtCodeSnippet and places some settings into ApplicationSettings.
Additionally Application- and ProjectSettings were abstracted to the common base class Settings, which takes care of the
getting and setting values of the Configmanager member.

src/lib/Application.cpp

@@ -1,5 +1,6 @@
 #include "Application.h"
 
+#include "ApplicationSettings.h"
 #include "component/view/MainView.h"
 #include "data/Storage.h"
 #include "gui/GuiFactory.h"
@@ -12,6 +13,8 @@ std::shared_ptr<Application> Application::create(GuiFactory* guiFactory)
 	std::shared_ptr<ConsoleLogger> consoleLogger = std::make_shared<ConsoleLogger>(); // TODO: move to main
 	LogManager::getInstance()->addLogger(consoleLogger);
 
+	ApplicationSettings::getInstance()->load("data/ApplicationSettings.xml");
+
 	std::shared_ptr<Application> ptr(new Application());
 	ptr->m_storage = std::make_shared<Storage>();