Allow to edit meta data on the app

[ktsn]

1. 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.