Lobby refactor + species loadouts support (#27576)

* Vox stuff

* Species loadouts and lobby refactor

The control flow for lobby is all over the shop so I pulled it all up from the individual controls so now they handle the bare minimum required and LobbyUIController handles the rest.

* a

* Bulk changes

* a

* weh

* Character import / export

* finalise

* woops this stuff too

* Also datafield exporting

* comments

* Review

Content.Shared/Humanoid/SharedHumanoidAppearanceSystem.cs

@@ -1,13 +1,22 @@
+using System.IO;
 using System.Linq;
+using Content.Shared.CCVar;
 using Content.Shared.Decals;
 using Content.Shared.Examine;
 using Content.Shared.Humanoid.Markings;
 using Content.Shared.Humanoid.Prototypes;
 using Content.Shared.IdentityManagement;
 using Content.Shared.Preferences;
+using Robust.Shared;
+using Robust.Shared.Configuration;
 using Robust.Shared.GameObjects.Components.Localization;
 using Robust.Shared.Network;
+using Robust.Shared.Player;
 using Robust.Shared.Prototypes;
+using Robust.Shared.Serialization.Manager;
+using Robust.Shared.Serialization.Markdown;
+using Robust.Shared.Utility;
+using YamlDotNet.RepresentationModel;
 
 namespace Content.Shared.Humanoid;
 
@@ -22,8 +31,10 @@ namespace Content.Shared.Humanoid;
 /// </summary>
 public abstract class SharedHumanoidAppearanceSystem : EntitySystem
 {
+    [Dependency] private readonly IConfigurationManager _cfgManager = default!;
     [Dependency] private readonly INetManager _netManager = default!;
     [Dependency] private readonly IPrototypeManager _proto = default!;
+    [Dependency] private readonly ISerializationManager _serManager = default!;
     [Dependency] private readonly MarkingManager _markingManager = default!;
 
     [ValidatePrototypeId<SpeciesPrototype>]
@@ -37,6 +48,37 @@ public abstract class SharedHumanoidAppearanceSystem : EntitySystem
         SubscribeLocalEvent<HumanoidAppearanceComponent, ExaminedEvent>(OnExamined);
     }
 
+    public DataNode ToDataNode(HumanoidCharacterProfile profile)
+    {
+        var export = new HumanoidProfileExport()
+        {
+            ForkId = _cfgManager.GetCVar(CVars.BuildForkId),
+            Profile = profile,
+        };
+
+        var dataNode = _serManager.WriteValue(export, alwaysWrite: true, notNullableOverride: true);
+        return dataNode;
+    }
+
+    public HumanoidCharacterProfile FromStream(Stream stream, ICommonSession session)
+    {
+        using var reader = new StreamReader(stream, EncodingHelpers.UTF8);
+        var yamlStream = new YamlStream();
+        yamlStream.Load(reader);
+
+        var root = yamlStream.Documents[0].RootNode;
+        var export = _serManager.Read<HumanoidProfileExport>(root.ToDataNode(), notNullableOverride: true);
+
+        /*
+         * Add custom handling here for forks / version numbers if you care.
+         */
+
+        var profile = export.Profile;
+        var collection = IoCManager.Instance;
+        profile.EnsureValid(session, collection!);
+        return profile;
+    }
+
     private void OnInit(EntityUid uid, HumanoidAppearanceComponent humanoid, ComponentInit args)
     {
         if (string.IsNullOrEmpty(humanoid.Species) || _netManager.IsClient && !IsClientSide(uid))