World placed objects overhaul

[Z1Meme]

• All freeplace entities in the world should be easily destructable to prevent griefing (not too many melee or projectile hits)

• Freeplace entities in the world should have heavier decay

• Freeplace entities should have a "protectionParent" assigned if they are not directly parented to another base part, meaning that they'll disappear if that parent respawns, and they are protected from extra damage / decay unless a player has demo perms on the parent.

• foundations / tampers / expansions need to check for lootableConstruction under placement area on placement

• Hidden player / container security in shelters should apply to all entities in a shelter (would also block explosions outside from killing players inside) Freeplace entities inside shelters/shacks don't despawn for outside players #2000

• All placable entities and characters should have a "securedShelter" variable that is the characterId of the shelter containing them, in order to check if they should / should not spawn for other players. Change "isHidden" back to a boolean and use that only for vanished characters / spectating.

[github-actions]

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