[VM] Make sure the virtual machine is eventually started

Much code depends on it being actually started, even if only just before
closing the plugin.

src/scripting/abc.h

@@ -465,6 +465,7 @@ friend class method_info;
 	bool addEvent(_NR<EventDispatcher>,_R<Event> ) DLL_PUBLIC;
 	int getEventQueueSize();
 	void shutdown();
+	bool hasEverStarted() const { return status!=CREATED; }
 
 	static Global* getGlobalScope(call_context* th);
 	static bool strictEqualImpl(ASObject*, ASObject*);

src/swf.cpp

@@ -522,7 +522,14 @@ void SystemState::destroy()
 	renderThread->wait();
 	inputThread->wait();
 	if(currentVm)
+	{
+		//If the VM exists it MUST be started to flush pending events.
+		//In some cases it will not be started by regular means, if so
+		//we will start it here.
+		if(!currentVm->hasEverStarted())
+			currentVm->start();
 		currentVm->shutdown();
+	}
 
 	l.release();