Expose bot state via interface

osu.Game/Models/RealmUser.cs

@@ -11,5 +11,7 @@ public class RealmUser : EmbeddedObject, IUser
         public int OnlineID { get; set; } = 1;
 
         public string Username { get; set; }
+
+        public bool IsBot => false;
     }
 }

osu.Game/Online/API/Requests/Responses/APIUser.cs

@@ -79,7 +79,7 @@ public class UserCover
         public bool IsBNG;
 
         [JsonProperty(@"is_bot")]
-        public bool IsBot;
+        public bool IsBot { get; set; }
 
         [JsonProperty(@"is_active")]
         public bool Active;

osu.Game/Users/IUser.cs

@@ -8,5 +8,7 @@ namespace osu.Game.Users
     public interface IUser : IHasOnlineID<int>
     {
         string Username { get; set; }
+
+        bool IsBot { get; }
     }
 }