data: stop indexing of files with fatal errors and store them as incomplete (issue 358)

* avoid AST traversial for CXX translation units with fatal errors
* save all files within those translation units as incomplete
* show number of complete files in finished indexing dialog and overview stats
* display incomplete files hatched in graph view
* display incomplete file titles hatched in code view
* mention file incompleteness in tooltips
* removed derived Indexer classes and set ParserType via template parameter instead
* moved getSourceFileFromCDB from IndexerCxxCdb to IndexerCommandCxxCdb

bug id = 358

src/lib_gui/qt/element/QtCodeFileTitleButton.h

@@ -17,9 +17,10 @@ public:
 
 	void setFilePath(const FilePath& filePath);
 	void setModificationTime(const TimePoint modificationTime);
+	void setIsComplete(bool isComplete);
 	void setProject(const std::string& name);
 
-	void checkModification();
+	void updateTexts();
 
 protected:
 	void contextMenuEvent(QContextMenuEvent* event);
@@ -30,6 +31,7 @@ private slots:
 private:
 	FilePath m_filePath;
 	TimePoint m_modificationTime;
+	bool m_isComplete;
 };
 
 #endif // QT_CODE_FILE_TITLE_BUTTON_H