Demiplan polishing (#524)

* 10 -> 20 sharpening stone durability

* auto destroy demiplans try 2 (better)

* start demiplan protection time

* buying demiplan key

* increase island size

Content.Server/_CP14/Demiplane/CP14DemiplanSystem.Stabilization.cs

@@ -0,0 +1,61 @@
+using Content.Shared._CP14.Demiplane.Components;
+using Content.Shared.Mobs.Systems;
+
+namespace Content.Server._CP14.Demiplane;
+
+public sealed partial class CP14DemiplaneSystem
+{
+    private readonly TimeSpan _checkFrequency = TimeSpan.FromSeconds(15f);
+    private TimeSpan _nextCheckTime = TimeSpan.Zero;
+
+    [Dependency] private readonly MobStateSystem _mobState = default!;
+
+    private void InitStabilization()
+    {
+        _nextCheckTime = _timing.CurTime + _checkFrequency;
+
+        SubscribeLocalEvent<CP14DemiplaneDestroyWithoutStabilizationComponent, MapInitEvent>(OnStabilizationMapInit);
+    }
+
+    private void OnStabilizationMapInit(Entity<CP14DemiplaneDestroyWithoutStabilizationComponent> ent, ref MapInitEvent args)
+    {
+        ent.Comp.EndProtectionTime = _timing.CurTime + ent.Comp.ProtectedSpawnTime;
+    }
+
+    private void UpdateStabilization(float frameTime)
+    {
+        if (_timing.CurTime < _nextCheckTime)
+            return;
+
+        _nextCheckTime = _timing.CurTime + _checkFrequency;
+
+        HashSet<EntityUid> stabilizedMaps = new();
+
+        var query = EntityQueryEnumerator<CP14DemiplaneStabilizerComponent, TransformComponent>();
+        while (query.MoveNext(out var uid, out var stabilizer, out var transform))
+        {
+            var map = transform.MapUid;
+
+            if (map is null)
+                continue;
+
+            if (stabilizer.RequireAlive && !(_mobState.IsAlive(uid) || _mobState.IsCritical(uid)))
+                continue;
+
+            if (stabilizedMaps.Contains(map.Value))
+                continue;
+
+            stabilizedMaps.Add(map.Value);
+        }
+
+        var query2 = EntityQueryEnumerator<CP14DemiplaneComponent, CP14DemiplaneDestroyWithoutStabilizationComponent>();
+        while (query2.MoveNext(out var uid, out var demiplan, out var stabilization))
+        {
+            if (_timing.CurTime < stabilization.EndProtectionTime)
+                continue;
+
+            if (!stabilizedMaps.Contains(uid))
+                QueueDel(uid);
+        }
+    }
+}