Implement a scheduler system for BladW announcements that supports both:
- Interval-based scheduling (e.g., "30m", "90s", "2h", "1d")
- Cron-based scheduling with standard 5-field format (minute hour day month weekday)
The scheduler parses configuration from BladW.Announcement.Schedules and manages timers automatically, cleaning up old timers on reload. Cron expressions are validated and compiled into matcher functions for efficient execution checking every 20 seconds.
Add network string registration for the announcement module:
- bladWOpenAnnouncementMenu: opens announcement menu on client
- bladWSendAnnouncement: receives announcement from admin
- bladWShowAnnouncement: broadcasts announcement to all players
Implement server-side announcement system with the following features:
- LimitChars() utility function to safely truncate strings with UTF-8 support
- bladw_amenu concommand to open announcement menu for players
- /bannonce and !bannonce chat commands as aliases for the menu
- Resolve() function to merge announcement presets with custom entries
- Broadcast() function to send announcements to all clients with proper length limits
- Net message receiver for admin announcement submissions
- Resource file declaration for sound asset download
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