Bug fixes

• 3026647: hook_requirements return FALSE, should return array instead (thanks, @rutiolma!)
• 3026680: Implement external libraries handling à la Webform

Fix priority of ResponseSubscriber

Changed the friendly name of the Small Ad entity.
Improved default config
Improved geo integration.
replaced simple hierarchical select & better exposed filters with chosen js

• Fix properties sync on widget subscription
• Add user agent to the Mailjet API HTTP calls in the proper way
• Improvement of contacts sync
• Fixed issues with subscriptions from the subscription widget

Bugfix:

#3025095 by jidrone: Support layout builder draggable

Work in progress, not (yet?) backward compatible with 8.x-1.x.

Please provide feedback !