Refactor: remove references to class World from util and luastack. These are low-level modules that should not reference class World.

luprex/cpp/core/world-core.cpp

@@ -131,8 +131,8 @@ World::World(WorldType wt) {
     LS.getglobaltable(globtab);
     LS.settabletype(globtab, LUA_TT_GLOBALENV);
 
-    // Store the world type in the registry.
-    LS.set_world_type(wt);
+    // Store whether the world is authoritative in the registry.
+    LS.set_authoritative(wt == WORLD_TYPE_MASTER);
         
     // Create the globaldb in the registry.
     LS.rawset(LuaRegistry, "globaldb", LuaNewTable);