Studio's Social media tab rework

These properties are shared in almost all social networks.

• title - will show as shared content snippet title
• description - will show as shared content description
• images - will show as shared content snippet image(s) - one image or more to choose from

This property is twitter only:

• twitter message - will only show as the content of a new tweet, probably appended with a short-URL to the tellmap automatically.

the data structure of content set to / returned by the “socialmediaeditor” plugin will change this way:

{
  en: {
    title: false,  // BOOL false indicates property is not used
    description: "some example content", 
    images: [ "http://some-example-url/image.jpg", "http://some-example-url/image2.jpg" ],
    twitter_message: "Some message here"
  }
}

According to this document, it will be needed to create only one “social media share” server-side version of the tellmap. Using the OG properties correctly, this should work greatly in all available social networks.