Allow to edit meta data on the app

[ktsn]

1. [x] Show pattern data (props, data, etc...) on the app
2. [ ] Allow users to edit their values.
3. [ ] The changes are pull back to the actual file (such as <birdseye> custom block on Vue SFC) by pressing something like "Save" button.

It would be useful also supporting the following features:

• [ ] Add a new pattern on the app.
• [ ] Remove an existing pattern on the app.