Targeted item actions (action/heal), item.add scenario action, inventory cell Decorate; mod cover

tests/FakeActionContext.cs

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+namespace Cthangover.Mods.Items.Tests
+{
+    using System.Collections.Generic;
+    using Cthangover.Core.Actions;
+    using Cthangover.Core.Items;
+    using Cthangover.Core.Mods;
+
+    /// <summary>Action context for scenario action tests: dialog variables and an inventory, no other services.</summary>
+    public class FakeActionContext : IActionContext
+    {
+        /// <summary>Dialog variables returned by <see cref="GetParam"/>.</summary>
+        public Dictionary<string, string> Params { get; } = new();
+
+        /// <summary>Warnings the action logged.</summary>
+        public List<string> Warnings { get; } = new();
+
+        public IQuestService Quests => null;
+        public ICharacterService Character => null;
+        public ILightingService Lighting => null;
+        public ISceneNodeService Scene => null;
+        public IModRegistry ModRegistry => null;
+        public IInventory Inventory { get; set; }
+        public IMapZoneService Map => null;
+
+        public string GetParam(string name) => Params.TryGetValue(name, out var value) ? value : null;
+
+        public void Log(string category, string message)
+        {
+        }
+
+        public void LogWarning(string category, string message) => Warnings.Add(message);
+    }
+}