Enhancements:
- Option to cloak Google Event attendee email addresses.
- Additional info/tip when changing "What" attributes to be synced.
- Handle Outlook and Google calendars being in different timezones.
- Automatically invert category selection when changing between include/exclude.
- New pseudo Outlook category "No category assigned".
Bugfix:
- Detect copied Outlook items and remove OGCS metadata from copy.
- Handle failure to update notification tray icon if not present.