Roundstart variation game rules (#24397)

* Raise `StationPostInitEvent` broadcast

* Basic variation pass handling

* standardize names + rule entities

* why does it work like that?

* add to defaults

* light break variation pass

* ent spawn entry

* move some stationevent utility functions to gamerule + add one for finding random tile on specified station

* forgot how statistics works

* powered light variation pass is good now

* station tile count function

* public method to ensure all solutions (for procedural use before mapinit)

* move gamerulesystem utility funcs to partial

* ensure all solutions before spilling in puddlesystem. for use when spilling before mapinit

* trash & puddle variation passes!

* oh yeah

* ehh lets live a little

* std

* utility for game rule check based on comp

* entprotoid the trash spawner oops

* generalize trash variation

* use added instead of started for secret rule

* random cleanup

* generic replacement variation system

* Wall rusting variation rule

* account for modifying while enumerating

* use localaabb

* fix test

* minor tweaks

* reinforced wall replacer + puddletweaker

(cherry picked from commit cc24ba6a317c4bee84ffa1eda8397c255ca92be9)

Content.Server/Station/Systems/StationSystem.cs

@@ -6,6 +6,7 @@ using Content.Server.Station.Events;
 using Content.Shared.CCVar;
 using Content.Shared.Station;
 using JetBrains.Annotations;
+using Robust.Server.GameObjects;
 using Robust.Server.Player;
 using Robust.Shared.Collections;
 using Robust.Shared.Configuration;
@@ -35,6 +36,7 @@ public sealed class StationSystem : EntitySystem
     [Dependency] private readonly GameTicker _gameTicker = default!;
     [Dependency] private readonly SharedTransformSystem _transform = default!;
     [Dependency] private readonly MetaDataSystem _metaData = default!;
+    [Dependency] private readonly MapSystem _map = default!;
 
     private ISawmill _sawmill = default!;
 
@@ -208,6 +210,23 @@ public sealed class StationSystem : EntitySystem
         return largestGrid;
     }
 
+    /// <summary>
+    /// Returns the total number of tiles contained in the station's grids.
+    /// </summary>
+    public int GetTileCount(StationDataComponent component)
+    {
+        var count = 0;
+        foreach (var gridUid in component.Grids)
+        {
+            if (!TryComp<MapGridComponent>(gridUid, out var grid))
+                continue;
+
+            count += _map.GetAllTiles(gridUid, grid).Count();
+        }
+
+        return count;
+    }
+
     /// <summary>
     /// Tries to retrieve a filter for everything in the station the source is on.
     /// </summary>
@@ -306,8 +325,8 @@ public sealed class StationSystem : EntitySystem
             AddGridToStation(station, grid, null, data, name);
         }
 
-        var ev = new StationPostInitEvent();
-        RaiseLocalEvent(station, ref ev);
+        var ev = new StationPostInitEvent((station, data));
+        RaiseLocalEvent(station, ref ev, true);
 
         return station;
     }