General slime improvements (#23425)

* General slime improvements

* Finish morphing

* oops 2x2 not 3x3

* actually lets ball - 2x3 inventory

* Last two things on the todo list

* .\RobustToolbox\

* JUST COMPILE

* fix tests 2.0

* fix tests 3.0

* Do reviews

* minor change

* guideboob

* more

---------

Co-authored-by: Kara <lunarautomaton6@gmail.com>

Content.Server/Geras/GerasSystem.cs

@@ -0,0 +1,40 @@
+using Content.Server.Actions;
+using Content.Server.Polymorph.Systems;
+using Content.Server.Popups;
+using Content.Shared.Actions;
+using Content.Shared.Geras;
+using Robust.Shared.Player;
+
+namespace Content.Server.Geras;
+
+/// <inheritdoc/>
+public sealed class GerasSystem : SharedGerasSystem
+{
+    [Dependency] private readonly ActionsSystem _actionsSystem = default!;
+    [Dependency] private readonly PolymorphSystem _polymorphSystem = default!;
+    [Dependency] private readonly PopupSystem _popupSystem = default!;
+
+    /// <inheritdoc/>
+    public override void Initialize()
+    {
+        SubscribeLocalEvent<GerasComponent, MorphIntoGeras>(OnMorphIntoGeras);
+        SubscribeLocalEvent<GerasComponent, MapInitEvent>(OnMapInit);
+    }
+
+    private void OnMapInit(EntityUid uid, GerasComponent component, MapInitEvent args)
+    {
+        // try to add geras action
+        _actionsSystem.AddAction(uid, ref component.GerasActionEntity, component.GerasAction);
+    }
+
+    private void OnMorphIntoGeras(EntityUid uid, GerasComponent component, MorphIntoGeras args)
+    {
+        var ent = _polymorphSystem.PolymorphEntity(uid, component.GerasPolymorphId);
+
+        if (!ent.HasValue)
+            return;
+
+        _popupSystem.PopupEntity(Loc.GetString("geras-popup-morph-message-others", ("entity", ent.Value)), ent.Value, Filter.PvsExcept(ent.Value), true);
+        _popupSystem.PopupEntity(Loc.GetString("geras-popup-morph-message-user"), ent.Value, ent.Value);
+    }
+}