data: saving errors to Storage

* saving errors in separate sqlite table
* use MessageShowErrors to show the errors in the UI
* show error count permanently in the right side of the status bar with click to show
* fixed clicking of error locations
* fixed expanding of files with errors

src/lib/component/controller/SearchController.cpp

@@ -31,6 +31,11 @@ void SearchController::handleMessage(MessageSearchAutocomplete* message)
 	getView()->setAutocompletionList(m_storageAccess->getAutocompletionMatches(message->query));
 }
 
+void SearchController::handleMessage(MessageShowErrors* message)
+{
+	getView()->setMatches(std::vector<SearchMatch>());
+}
+
 SearchView* SearchController::getView()
 {
 	return Controller::getView<SearchView>();