Fix regions loading hack (#375)

Fix regions loading hack with awaiting

Obsidian/WorldData/World.cs

@@ -800,20 +800,14 @@ internal async Task GenerateWorldAsync(bool setWorldSpawn = false)
 
         int regionPregenRange = (pregenerationRange >> Region.CubicRegionSizeShift) + 1;
 
-        Parallel.For(-regionPregenRange, regionPregenRange, async x =>
+        await Parallel.ForEachAsync(Enumerable.Range(-regionPregenRange, regionPregenRange * 2 + 1), async (x, _) =>
         {
             for (int z = -regionPregenRange; z < regionPregenRange; z++)
             {
                 await LoadRegionAsync(x, z);
             };
         });
 
-        // I don't know why we still have null regions when we get here ¯\_(ツ)_/¯
-        while (Regions.Any(r => r.Value is null))
-        {
-            await Task.Delay(100);
-        }
-
         for (int x = -pregenerationRange; x < pregenerationRange; x++)
         {
             for (int z = -pregenerationRange; z < pregenerationRange; z++)