Edit Contacts

Add separate modal window to edit contact. Supported actions are to change the contact display name to a custom display name. If the user is online, there is the ability to sync the contacts display name. 

Removal of contact is moved to this screen.
Because I don't want to repeat the code to reopen the contactsmanager window in the contactsmanager directive -> e.g. when closing the contactsmanageredit window the contactsmanager window has to reopen.