oc-calendar: Use the calendar's time zone if it is present

If the event was created by the MAPI client, the client's time zone (if
present) is assigned to the event's calendar in iCalEvent+MAPIStore.
This way, we can use it to deliver the event's properties correctly.

OpenChange/MAPIStoreAppointmentWrapper.h

@@ -24,6 +24,7 @@
 #define MAPISTORECALENDARWRAPPER_H
 
 #import <NGCards/iCalPerson.h>
+#import <NGCards/iCalTimeZone.h>
 #import <Appointments/iCalEntityObject+SOGo.h>
 
 #import "MAPIStoreObjectProxy.h"
@@ -42,7 +43,7 @@
   iCalCalendar *calendar;
   iCalEvent *firstEvent;
   iCalEvent *event;
-  NSTimeZone *timeZone;
+  iCalTimeZone *timeZone;
   SOGoUser *user;
   NSString *senderEmail;
   NSData *globalObjectId;
@@ -57,12 +58,10 @@
 + (id) wrapperWithICalEvent: (iCalEvent *) newEvent
                     andUser: (SOGoUser *) newUser
              andSenderEmail: (NSString *) newSenderEmail
-                 inTimeZone: (NSTimeZone *) newTimeZone
          withConnectionInfo: (struct mapistore_connection_info *) newConnInfo;
 - (id) initWithICalEvent: (iCalEvent *) newEvent
                  andUser: (SOGoUser *) newUser
           andSenderEmail: (NSString *) newSenderEmail
-              inTimeZone: (NSTimeZone *) newTimeZone
       withConnectionInfo: (struct mapistore_connection_info *) newConnInfo;
 
 /* getters */