src: miscellaneous bug fixes for upcoming release

* only randomize parsing order of source files for multithreaded indexing
* fixed overview not displayed when switching projects due to MessageScrollCode being dispatched
* avoid adding duplicate TokenLocations that causes highlighting to break in QtCodeArea
* clear all controllers when switching project
* maximize unindexed file when clicking title instead of activating it

src/lib_gui/qt/element/QtCodeFile.cpp

@@ -405,19 +405,6 @@ void QtCodeFile::clickedTitleBar()
 void QtCodeFile::clickedTitle()
 {
 	MessageActivateFile(m_filePath).dispatch();
-
-	// TODO: check if external file and maximize instead
-
-	// MessageChangeFileView msg(
-	// 	message->filePath,
-	// 	MessageChangeFileView::FILE_MAXIMIZED,
-	// 	true,
-	// 	false,
-	// 	nullptr
-	// );
-	// msg.setIsReplayed(message->isReplayed());
-	// msg.setKeepContent(message->keepContent());
-	// msg.dispatch();
 }
 
 void QtCodeFile::editProject()