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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