oc-calendar: Add edit/delete own and Folder Contact/Owner sharing perm

By storing these custom MAPI roles in the ACL.

The extension field 'X-SOGO-COMPONENT-CREATED-BY' is used to store the
event creator when it is done from Outlook. It is the same field SOGo
uses when an event is created from a shared folder in the webmail.

The creator and the organizer/owner of the event can be different and it can
be used from external sources by checking the organizer field. This matches
the specification from [MS-OXOCAL] Section 1.1 which defines the organizer
as the owner or creator of the event.

OpenChange/MAPIStoreCalendarEmbeddedMessage.m

@@ -208,6 +208,7 @@
   [[container event] updateFromMAPIProperties: properties
                                 inUserContext: [self userContext]
                                withActiveUser: activeUser
+                                        isNew: NO
 				     inMemCtx: memCtx];
 }