Calendar API: Local Calendars, Cloud Sync, and Conflict Handling

Codename One has released `com.codename1.calendar`, a new API that unifies local and cloud calendar access.

It supports events, tasks, recurrence, attendees, alarms, authorization, and incremental synchronization.

Offline mutations can be queued and later synced, while version tokens help detect and avoid overwrite conflicts.

Developers can use one data model across iOS, Android, desktop, web, and services like Google Calendar, Microsoft To Do, and CalDAV.