POC: WPBakery Compatibility

[JarrydLong]

All Submissions:

• Have you followed the Contributing guideline?
• Does your code follow the WordPress' coding standards?
• Have you checked to ensure there aren't other open Pull Requests for the same update/change?

Changes proposed in this Pull Request:

Implements compatibility support for the WP Bakery Page Builder

How to test the changes in this Pull Request:

1. Install WP Bakery
2. Add a 'Text' field to the page
3. Hit the settings button and scroll to the bottom.
4. Enter in level ID's in the Paid Memberships Pro field
5. The content will show/hide accordingly.

Other information:

• Have you added an explanation of what your changes do and why you'd like us to include them?
• Have you successfully run tests with your changes locally?

[kimcoleman]

@JarrydLong did some adjusting here - I am up in the air on if this is complete enough to merge in. Its strange how WP Bakery works that you have to basically rewrite their "shortcodes" / component like this. Makes me worry if a theme is doing this, it wouldn't work for the membership site.

But if people are asking for this, it is working now.

I adjusted some things here and also added a bail if in the context of the live editor so admins can build with this in the editing experience without content getting restricted. Give me a thumbs up or down on if you think we should hold this back to 3.1 or go for it now.

[JarrydLong]

I think it works well for an MVP but maybe leave it for 3.1. Extending it to support other fields is quite easy which we can do (doesn't even need to be in a cycle) and have everything align with the other page builder integrations