Refactor conversation stuff

cutscene/conversation/ConversationResource.gd

@@ -0,0 +1,9 @@
+extends Resource
+class_name ConversationResource
+const ConversationAction = preload("res://cutscene/conversation/ConversationAction.gd")
+
+@export_node_path("Entity") var entity:NodePath
+@export_multiline var label: String
+
+func toCallable() -> Dictionary:
+  return ConversationAction.getTextboxCallable(label)