Adds a simple shadow multiplayer system to Subnautica.
The idea is that only player positions should be synced and maybe eventually the vehicle they use.
Subnautica was designed as a single-player game, and there are not enough resources for everyone to finish it in multiplayer. Syncing the players only and having everyone play on their own saves fixes this.
It's over at https://github.com/Ccode-lang/ShadowServer
This software is under active development and is not stable currently. This code is a very early prototype that barely works in some situations.