Gateway destinations (#21040)

* Gateway generation

* Gateway stuff

* gatewehs

* mercenaries

* play area

* Range fixes and tweaks

* weh

* Gateway UI polish

* Lots of fixes

* Knock some items off

* Fix dungeon spawning

Realistically we should probably be using a salvage job.

* wahwah

* wehvs

* expression

* weh

* eee

* a

* a

* WEH

* frfr

* Gatwey

* Fix gateway windows

* Fix gateway windows

* a

* a

* Better layer masking

* a

* a

* Noise fixes

* a

* Fix fractal calculations

* a

* More fixes

* Fixes

* Add layers back in

* Fixes

* namespaces and ftl

* Other TODO

* Fix distance

* Cleanup

* Fix test

Content.Server/Movement/Systems/BoundarySystem.cs

@@ -0,0 +1,32 @@
+using Content.Shared.Movement.Components;
+using Robust.Shared.Physics.Events;
+
+namespace Content.Server.Movement.Systems;
+
+public sealed class BoundarySystem : EntitySystem
+{
+    /*
+     * The real reason this even exists is because with out mover controller it's really easy to clip out of bounds on chain shapes.
+     */
+
+    [Dependency] private readonly SharedTransformSystem _xform = default!;
+
+    public override void Initialize()
+    {
+        base.Initialize();
+        SubscribeLocalEvent<BoundaryComponent, StartCollideEvent>(OnBoundaryCollide);
+    }
+
+    private void OnBoundaryCollide(Entity<BoundaryComponent> ent, ref StartCollideEvent args)
+    {
+        var center = _xform.GetWorldPosition(ent.Owner);
+        var otherXform = Transform(args.OtherEntity);
+        var collisionPoint = _xform.GetWorldPosition(otherXform);
+        var offset = collisionPoint - center;
+        offset = offset.Normalized() * (offset.Length() - ent.Comp.Offset);
+        // If for whatever reason you want to yeet them to the other side.
+        // offset = new Angle(MathF.PI).RotateVec(offset);
+
+        _xform.SetWorldPosition(otherXform, center + offset);
+    }
+}