oc: Update predecessor change list on saving

There were cases where only the change key was updated (GCS) or
others were the change key was updated with wrong info.

This changeset has as goal to update the predecessor change list
and, change key if required, on saving taking into account the latest information
given by the client in high level ROPs such as ImportMessageMove
or SetProperties, and merge it with information provided by the server
backend (IMAP server, SOGo DB) using `synchroniseCache`.

For more details about `PidTagChangeKey` and `PidTagPredecessorChangeList`
property values check [MS-OXCFXICS] Section 2.2.1.2

OpenChange/MAPIStoreGCSMessage.m

@@ -209,13 +209,16 @@
 
 - (void) updateVersions
 {
-  NSData *newChangeKey;
+  /* Update ChangeKey and PredecessorChangeList on message's save */
+  NSData *newChangeKey, *predecessorChangeList;
 
   newChangeKey = [properties objectForKey: MAPIPropertyKey (PR_CHANGE_KEY)];
+  predecessorChangeList = [properties objectForKey: MAPIPropertyKey (PR_PREDECESSOR_CHANGE_LIST)];
 
   [(MAPIStoreGCSFolder *) container
-    updateVersionsForMessageWithKey: [self nameInContainer]
-                      withChangeKey: newChangeKey];
+      updateVersionsForMessageWithKey: [self nameInContainer]
+                        withChangeKey: newChangeKey
+             andPredecessorChangeList: predecessorChangeList];
 }
 
 @end