src: Project Refactoring

* Added language specific Project and ProjectSettings
* moved project specific code from Application to Project
* made Application a singleton
* added handleDialog method to Application which displays a dialog window and waits for user input
* Added ScopedFunctor that executes a function when deleted

src/lib/data/SqliteStorage.h

@@ -35,6 +35,8 @@ public:
 
 	bool isEmpty() const;
 	bool isIncompatible() const;
+	std::string getProjectSettingsText() const;
+	void setProjectSettingsText(std::string text);
 
 	void setVersion();