logic: Added indexing mode to reindex incomplete files (issue #493, #496)

* added radio buttons to start indexing dialog
* don't block task scheduler thread while start indexing dialog is visible
* don't force whole project refresh on settings change
* added help button to start indexing dialog explaining indexing modes
* disable unavailable modes when project needs full refresh
* improved label texts on indexing dialogs
* added --incomplete flag to index command of commandline API
* fixed deletion of window stack elements

src/lib_gui/qt/QtApplication.cpp

@@ -30,7 +30,7 @@ bool QtApplication::event(QEvent *event)
 
 		if (path.exists() && (path.extension() == ".srctrlprj" || path.extension() == ".coatiproject"))
 		{
-			MessageLoadProject(path, false).dispatch();
+			MessageLoadProject(path).dispatch();
 			return true;
 		}
 	}