Add mapping editor (#23427)

* Add mapping editor (#757)

* Remove mapping actions, never again

* Cleanup actions system

* Jarvis, remove all references to CM14

* Fix InventoryUIController crashing when an InventoryGui is not found

* Rename mapping1 to mapping

* Clean up context calls

* Add doc comments

* Add delegate for hiding decals in the mapping screen

* Jarvis mission failed

* a

* Add test

* Fix not flushing save stream in mapping manager

* change

* Fix verbs

* fixes

* localise

---------

Co-authored-by: DrSmugleaf <DrSmugleaf@users.noreply.github.com>
Co-authored-by: metalgearsloth <31366439+metalgearsloth@users.noreply.github.com>
Co-authored-by: metalgearsloth <comedian_vs_clown@hotmail.com>
Co-authored-by: Pieter-Jan Briers <pieterjan.briers+git@gmail.com>

Content.Client/Mapping/MappingPrototype.cs

@@ -0,0 +1,39 @@
+using Content.Shared.Decals;
+using Content.Shared.Maps;
+using Robust.Shared.Prototypes;
+
+namespace Content.Client.Mapping;
+
+/// <summary>
+///     Used to represent a button's data in the mapping editor.
+/// </summary>
+public sealed class MappingPrototype
+{
+    /// <summary>
+    ///     The prototype instance, if any.
+    ///     Can be one of <see cref="EntityPrototype"/>, <see cref="ContentTileDefinition"/> or <see cref="DecalPrototype"/>
+    ///     If null, this is a top-level button (such as Entities, Tiles or Decals)
+    /// </summary>
+    public readonly IPrototype? Prototype;
+
+    /// <summary>
+    ///     The text to display on the UI for this button.
+    /// </summary>
+    public readonly string Name;
+
+    /// <summary>
+    ///     Which other prototypes (buttons) this one is nested inside of.
+    /// </summary>
+    public List<MappingPrototype>? Parents;
+
+    /// <summary>
+    ///     Which other prototypes (buttons) are nested inside this one.
+    /// </summary>
+    public List<MappingPrototype>? Children;
+
+    public MappingPrototype(IPrototype? prototype, string name)
+    {
+        Prototype = prototype;
+        Name = name;
+    }
+}