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/Preferences/Loadouts/Loadout.cs

@@ -6,8 +6,9 @@ namespace Content.Shared.Preferences.Loadouts;
 /// <summary>
 /// Specifies the selected prototype and custom data for a loadout.
 /// </summary>
-[Serializable, NetSerializable]
-public sealed class Loadout
+[Serializable, NetSerializable, DataDefinition]
+public sealed partial class Loadout
 {
+    [DataField]
     public ProtoId<LoadoutPrototype> Prototype;
 }