logic: Fixed refreshing when source paths were removed

* Define exit state for TaskRepeatWhileSuccess
* Added TaskFinishParsing to end of parsing task sequence
* Also measure time spend clearing files in total index time

src/lib/data/PersistentStorage.h

@@ -67,8 +67,7 @@ public:
 
 	void logStats() const;
 
-	void startParsing();
-	void finishParsing();
+	void buildCaches();
 
 	void optimizeMemory();