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/component/controller/IDECommunicationController.cpp

@@ -24,6 +24,10 @@ IDECommunicationController::~IDECommunicationController()
 {
 }
 
+void IDECommunicationController::clear()
+{
+}
+
 void IDECommunicationController::handleIncomingMessage(const std::string& message)
 {
 	if (m_enabled == false)