Quest system fixed.

scripts/Singleton/UI.gd

@@ -3,3 +3,7 @@ class_name UISystem extends Control
 func _process(delta: float) -> void:
 	# This needs to always be at the end of the parent node's tree
 	get_parent().move_child(self, get_parent().get_child_count() - 1)
+
+func showQuestsMenu(questKey = null) -> void:
+	$QuestMenu.setQuest(questKey)
+	$QuestMenu.show()