Fix bugs

- Set lock for sending message and adjust textfield clear flow.
- Make message selectable.

New features

- The users can chat with OpenAI now.
- An AI chat room will be created if it isn't existed originally.

New features

- The user can change name after registration now.

Local database is fine

- Sync data from firebase to local database.

Fix bugs

- Chat isn't sync.

Works on Firebase.

Updates

- With authentication provided by firebase.
  - Sign in
  - Create account
- Add friends (chat room) by email.
- Chat history is saved in firebase firestore.

Things Todo

- Also save data in local database.
- Compare updated_time and update data at local database or firestore.
- Using Stream to listen changes of chat.

Fix bug

- There is no verticle padding on TextField content when being multiline.
- The last message preview shouldn't be multiline.

Fix bug

- Update chat preview when message sent.

Meet the basic requirement of the assignment

- A nice view.
- Loads messages from local database.
- Sends messages and save to local database.

Merge pull request #3 from an920107/action

release test.