Add ULTRALogger server event logger

[KingParmenides]

Summary

• Add a standalone ULTRALogger utility mod with a server-only session component
• Write timestamped local-storage logs for grid lifecycle, block changes, player roster/control changes, damage, admin commands, external mod messages, and optional CoreSystems projectile damage events
• Add admin chat commands for enable/disable, flush, save/scan intervals, queue size, and event categories
• Document the /ultralogger commands and external API channel for other mods

Fixes #1129

Testing

• Ran a local C# compiler syntax check; it reached only expected missing Space Engineers/VRage assembly references because this repo does not include a normal build project or game DLLs.
• Verified no open PR currently targets #1129 or ULTRALogger before submission.

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