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/QtCodeFile.cpp

@@ -293,6 +293,11 @@ void QtCodeFile::setWholeFile(bool isWholeFile, int refCount)
 	updateRefCount(isWholeFile ? 0 : refCount);
 }
 
+void QtCodeFile::setIsComplete(bool isComplete)
+{
+	m_title->setIsComplete(isComplete);
+}
+
 void QtCodeFile::setMinimized()
 {
 	for (std::shared_ptr<QtCodeSnippet> snippet : m_snippets)
@@ -376,7 +381,7 @@ void QtCodeFile::updateSnippets()
 
 void QtCodeFile::updateTitleBar()
 {
-	m_title->checkModification();
+	m_title->updateTexts();
 }
 
 void QtCodeFile::clickedMinimizeButton() const