Mid-game prototype loading for game admins (#5675)

Content.Shared/Administration/GamePrototypeLoadMessage.cs

@@ -0,0 +1,25 @@
+using System;
+using Lidgren.Network;
+using Robust.Shared.Network;
+using Robust.Shared.Serialization;
+
+namespace Content.Shared.Administration;
+
+[NetSerializable]
+[Serializable]
+public class GamePrototypeLoadMessage : NetMessage
+{
+    public override MsgGroups MsgGroup => MsgGroups.String;
+
+    public string PrototypeData { get; set; } = string.Empty;
+
+    public override void ReadFromBuffer(NetIncomingMessage buffer)
+    {
+        PrototypeData = buffer.ReadString();
+    }
+
+    public override void WriteToBuffer(NetOutgoingMessage buffer)
+    {
+        buffer.Write(PrototypeData);
+    }
+}

Content.Shared/Administration/IGamePrototypeLoadManager.cs

@@ -0,0 +1,11 @@
+using System;
+
+namespace Content.Shared.Administration;
+
+public interface IGamePrototypeLoadManager
+{
+    public void Initialize();
+    public void SendGamePrototype(string prototype);
+
+    event Action GamePrototypeLoaded;
+}

Content.Shared/Chemistry/Reaction/SharedChemicalReactionSystem.cs

@@ -1,5 +1,6 @@
 using System.Collections.Generic;
 using System.Diagnostics.CodeAnalysis;
+using Content.Shared.Administration;
 using Content.Shared.Administration.Logs;
 using Content.Shared.Chemistry.Components;
 using Content.Shared.Chemistry.Reagent;
@@ -24,6 +25,7 @@ namespace Content.Shared.Chemistry.Reaction
         [Dependency] private readonly IPrototypeManager _prototypeManager = default!;
         [Dependency] private readonly IRobustRandom _random = default!;
         [Dependency] protected readonly SharedAdminLogSystem _logSystem = default!;
+        [Dependency] private readonly IGamePrototypeLoadManager _gamePrototypeLoadManager = default!;
 
         /// <summary>
         ///     A cache of all existant chemical reactions indexed by one of their
@@ -37,6 +39,7 @@ namespace Content.Shared.Chemistry.Reaction
 
             InitializeReactionCache();
             _prototypeManager.PrototypesReloaded += OnPrototypesReloaded;
+            _gamePrototypeLoadManager.GamePrototypeLoaded += InitializeReactionCache;
         }
 
         /// <summary>