logic: Ask user before reparsing the project

While the message box with the question is visible the ui is blocked. A message appears when:
* when project was edited
* when preferences were edited
* when project file has more recent changes than db
* when db has a different version than Coati

src/lib/data/Storage.h

@@ -22,9 +22,10 @@ public:
 	Storage(const FilePath& dbPath);
 	virtual ~Storage();
 
+	FilePath getDbFilePath() const;
 	Version getVersion() const;
 
-	bool init();
+	void init();
 	void clear();
 	void clearCaches();