Move "concerned product" block to the top of aside column in variant group editor.
Remove \Change\Events\EventManagerFactory

Populate application and services on event by new shared listeners with priority (> 9995)
Merge pull request #891 from inthause/documents

Remove \Change\Events\EventManagerFactory
Fix variant group prices editor
Enhance indexation for variant product
Add ProductSet
Add coupon, discounts and fees edition in orders.