Switch the deep sea island test prefab to only network to deep sea

Keep the `globalBroadcast` bool the same instead of switching to a "SpecialNetworkGroup" bool, instead make the enum "GlobalNetworkBehavior" - switch between 3 network groups (global, main island, deep sea) based on the enum - add the correct network group to subscriptions based on the bounds of the network group you are part of - re-add tooltip to `globalBroadcast` we removed

Add multiple global network groups - entire server - main island only - deep sea only Set global network group ids as constants Create enum to represent different types of global network groups Add enum to BaseEnitty (but keep globalBroadcast bool)

update deep_sea/networking

Make single method to get all passengers: mounted in seats or standing on the boat parented - ensures players standing on tugboat get shown a respawn screen

Teleport the tugboat if you are standing on one while running `enterdeepsea` (why did this work straight away??)

Make entering & exiting the deep sea work when you are inside a vehicle - target the teleport on the vehicle instead of the player - a bunch of debugging to get it doing the right order of switching groups without the vehicle being deleted on the client - dismount player before teleport, remount after (may have to revisit network groups and add proper support to get it working when standing parented on a tugboat instead of mounted in a seat)