Cleaned and improved some event stuff

scripts/Singleton/EventSystem.gd

@@ -47,4 +47,25 @@ func eventAreFlagsOff(event:SpecialEvent, flagsToCheck:int) -> bool:
 func eventIsAnyOfFlagsOff(event:SpecialEvent, flagsToCheck:int) -> bool:
 	if !eventFlags.has(event):
 		eventFlags[event] = 0;
-	return (eventFlags[event] & flagsToCheck) != flagsToCheck;
+	return (eventFlags[event] & flagsToCheck) != flagsToCheck;
+
+# Adds an event that is created by code into the scene tree and lets it be
+# managed properly by the event system.
+func addEvent(event:Event) -> void:
+	assert(
+		!event.is_inside_tree(),
+		"Event is already inside the scene tree, cannot add it again."
+	)
+
+	$StartedEvents.add_child(event)
+	event.inEventSystemTree = true
+
+func removeEvent(event:Event) -> void:
+	assert(
+		event.inEventSystemTree,
+		"Event is not inside event system tree."
+	)
+
+	event.inEventSystemTree = false
+	$StartedEvents.remove_child(event)
+	event.queue_free()