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/iCalEvent+MAPIStore.m

@@ -247,6 +247,7 @@
 - (void) updateFromMAPIProperties: (NSDictionary *) properties
                     inUserContext: (MAPIStoreUserContext *) userContext
                    withActiveUser: (SOGoUser *) activeUser
+                            isNew: (BOOL) isNew
                          inMemCtx: (TALLOC_CTX *) memCtx
 {
   BOOL isAllDay;
@@ -573,6 +574,14 @@
             }
         }
     }
+  // Creator (with sharing purposes)
+  if (isNew)
+    {
+      value = [properties objectForKey: MAPIPropertyKey (PidTagLastModifierName)];
+      if (value)
+        [[self uniqueChildWithTag: @"x-sogo-component-created-by"] setSingleValue: value
+                                                                           forKey: @""];
+    }
 }
 
 @end