ui: added ApplicationSettingsScreen

* opens on first start autmatically
* open from the menu under Preferences
* show version number on splash screen
* added recent projects markup to app settings template
* moved all qt window classes to qt/window
* put common form stuff from project setup and app settings into QtSettingsWindow

src/lib/Project.h

@@ -17,8 +17,8 @@ public:
 
 	~Project();
 
-	bool loadProjectSettings(const std::string& projectSettingsFile);
-	bool saveProjectSettings(const std::string& projectSettingsFile);
+	bool loadProjectSettings(const FilePath& projectSettingsFile);
+	bool saveProjectSettings(const FilePath& projectSettingsFile);
 	void clearProjectSettings();
 	void reloadProjectSettings();
 
@@ -38,7 +38,7 @@ private:
 
 	StorageAccessProxy* const m_storageAccessProxy;
 
-	std::string m_projectSettingsFilepath;
+	FilePath m_projectSettingsFilepath;
 	FileManager m_fileManager;
 
 	std::shared_ptr<Storage> m_storage;