refactor: collapse hooks into nested frozen dictionary

CommandHook/CommandHookModSystem.cs

@@ -1,4 +1,4 @@
-using System;
+using System.Collections.Frozen;
 using Vintagestory.API.Common;
 using Vintagestory.API.Datastructures;
 using Vintagestory.API.Server;
@@ -7,9 +7,8 @@ namespace CommandHook;
 
 public class CommandHookModSystem : ModSystem
 {
-    private ModEntry[] modEntries = Array.Empty<ModEntry>();
-    private HookEntry[] hashTable = Array.Empty<HookEntry>();
-    private uint hashTableSize = 0;
+    private FrozenDictionary<string, FrozenDictionary<string, CommandRegistration>> registrations =
+        FrozenDictionary<string, FrozenDictionary<string, CommandRegistration>>.Empty;
 
     public override bool ShouldLoad(EnumAppSide forSide) => forSide == EnumAppSide.Server;
 

CommandHook/HookEntry.cs

@@ -1,13 +0,0 @@
-namespace CommandHook;
-
-public struct HookEntry
-{
-    public readonly string? CommandName; // null = wildcard
-    public readonly CommandRegistration Registration;
-
-    public HookEntry(string? commandName, CommandRegistration registration)
-    {
-        CommandName = commandName;
-        Registration = registration;
-    }
-}

CommandHook/ModEntry.cs

@@ -1,13 +0,0 @@
-namespace CommandHook;
-
-public struct ModEntry
-{
-    public readonly string ModId;
-    public readonly HookEntry[] Hooks;
-
-    public ModEntry(string modId, HookEntry[] hooks)
-    {
-        ModId = modId;
-        Hooks = hooks;
-    }
-}