feature: Add server option for default random NPC spawning behavior

[WeylonSantana]

Description

enum with AccessibleOnly (default, changes the behavior from what it is now) and Unrestricted (what it is now)

Intended Use-Case

This only controls what the default is for a map, and the map needs to have the property as well. Reason being is there are two ways to get into a space in a map, walk via border, or warp

Duplicate Check

• This feature request is not a duplicate to the best of my knowledge.