Action stuff (#31305)

* Action stuff

- Cleanup some event stuff
- Avoid dirtying entity unnecessarily
- Add ActionGrant as an easy way to apply / remove actions via compregistry.

* Fix merge

Content.Shared/Actions/ActionGrantSystem.cs

@@ -0,0 +1,48 @@
+namespace Content.Shared.Actions;
+
+/// <summary>
+/// <see cref="ActionGrantComponent"/>
+/// </summary>
+public sealed class ActionGrantSystem : EntitySystem
+{
+    [Dependency] private readonly SharedActionsSystem _actions = default!;
+
+    public override void Initialize()
+    {
+        base.Initialize();
+        SubscribeLocalEvent<ActionGrantComponent, MapInitEvent>(OnMapInit);
+        SubscribeLocalEvent<ActionGrantComponent, ComponentShutdown>(OnShutdown);
+        SubscribeLocalEvent<ItemActionGrantComponent, GetItemActionsEvent>(OnItemGet);
+    }
+
+    private void OnItemGet(Entity<ItemActionGrantComponent> ent, ref GetItemActionsEvent args)
+    {
+        if (!TryComp(ent.Owner, out ActionGrantComponent? grant))
+            return;
+
+        foreach (var action in grant.ActionEntities)
+        {
+            args.AddAction(action);
+        }
+    }
+
+    private void OnMapInit(Entity<ActionGrantComponent> ent, ref MapInitEvent args)
+    {
+        foreach (var action in ent.Comp.Actions)
+        {
+            EntityUid? actionEnt = null;
+            _actions.AddAction(ent.Owner, ref actionEnt, action);
+
+            if (actionEnt != null)
+                ent.Comp.ActionEntities.Add(actionEnt.Value);
+        }
+    }
+
+    private void OnShutdown(Entity<ActionGrantComponent> ent, ref ComponentShutdown args)
+    {
+        foreach (var actionEnt in ent.Comp.ActionEntities)
+        {
+            _actions.RemoveAction(ent.Owner, actionEnt);
+        }
+    }
+}