1. Replace daysSurvived to getWorldAgeDays for calculating Horde Night day, keeping it consistent to every players on the server.

1.Fixing the issue where in MP if there is a player with no admin access, the zombies won't spawn.
2.Changed the sandbox settings' max value for First HordeNight Day and Frequency, for people want longer experience.

1. should work on MP now.
2.fixing the MP issue by dressing zombies with outfits... yes, very true.

1.Lower spawn time
2.Currently not work on MP

1. Fixing a Issue where Client side player can't see the Horde Night zombies.
2. Adding a new sandbox option for people like random Horde Night