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/Project.cpp

@@ -78,7 +78,7 @@ void Project::loadStorage()
 	{
 		m_storage->startParsing();
 		m_storage->finishParsing();
-		MessageFinishedParsing(0, 0, 0, 0).dispatch();
+		MessageFinishedParsing(0, 0, 0, m_storage->getErrorCount()).dispatch();
 	}
 	else
 	{