Merge pull request #4574 from ZappoMan/crashOnExit

fix crash on shutdown related to entity scripts connecting to signals

interface/src/Application.cpp

@@ -567,6 +567,9 @@ void Application::aboutToQuit() {
 }
 
 void Application::cleanupBeforeQuit() {
+
+    _entities.clear(); // this will allow entity scripts to properly shutdown
+
     _datagramProcessor->shutdown(); // tell the datagram processor we're shutting down, so it can short circuit
     _entities.shutdown(); // tell the entities system we're shutting down, so it will stop running scripts
     ScriptEngine::stopAllScripts(this); // stop all currently running global scripts

libraries/entities-renderer/src/EntityTreeRenderer.cpp

@@ -107,6 +107,7 @@ void EntityTreeRenderer::init() {
 }
 
 void EntityTreeRenderer::shutdown() {
+    _entitiesScriptEngine->disconnect(); // disconnect all slots/signals from the script engine
     _shuttingDown = true;
 }