refactors adminmenu a timid amount (#5095)

Co-authored-by: Paul <ritter.paul1+git@googlemail.com>
Co-authored-by: metalgearsloth <comedian_vs_clown@hotmail.com>

Content.Shared/Administration/PlayerInfo.cs

@@ -0,0 +1,10 @@
+using System;
+using Robust.Shared.GameObjects;
+using Robust.Shared.Network;
+using Robust.Shared.Serialization;
+
+namespace Content.Shared.Administration
+{
+    [Serializable, NetSerializable]
+    public record PlayerInfo(string Username, string CharacterName, bool Antag, EntityUid EntityUid, NetUserId SessionId);
+}