Breaking change: built-in WebHook changed format of JSON data

Description

Changed the built-in Webhook JSON format to be compatible with https://zapier.com/

Breaking change

• Change CallWebHookAfterSubmissionActor
• Change format of JSON data send by webhook from JSON array to single JSON object.
• Change format from [ {"Key":"keyname","Value":"objectvalue"}

  ,{"Key"...] to

  {"keyname":"objectvalue","keyname2"...}