Add settings kb and prompt, and related commands

[AndydeCleyre]

# ColorCodeBot
## Settings
- Guessing is **on**
- This group's default syntax is **`sh`**
- I will respond to everyone who:
  - [ ] sends /watchme
  - [x] **doesn't send /ignoreme**

Buttons:

• [ ] ~Toggle guessing~ nah
• [x] Choose default syntax
• [x] Toggle blocklist/allowlist

Separate from the settings, two commands for individual group members:

• [x] /ignoreme
• [x] /watchme

related: #35