Update admin styles:
 - make document-list markup usable outside from a real document list
 - fix styles of panels
Add isPropertyModified() method on editors.
Update order editor:
 - the order is now editable only if the processingStatus is "edition"
 - add buttons to switch between "edition" and "processing" statuses
 - homogenize line adding
 - don't use a document list for lines (they are not documents) but use the same markup
 - show discounts and fees in total
 - some other fixes and visual enhancements
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
Add coupon, discounts and fees edition in orders.