Brain update!

Update 0.2a

1. Totally new main prompt. She now feels more natural and human.
2. No more orders: She won't follow your orders if she doesn't want to.
3. Totally new sentiment analysis: She will now have better reactions both in responses and expressions.
4. Memory: I've nerfed Lilith's memory due to the costs of LLM. Now, she will remember the last 5 messages of the chat, which should be enough for us to have a nice chat and evaluate.
5. Versioning: This is an alpha version, so starting from this update, the name will be 0.2a (second update, alpha).