Work on GUI

There is still a long way till it's done...

GUI/BotStatusForm.cs

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+using System;
+using System.Collections.Concurrent;
+using System.ComponentModel;
+using System.Windows.Forms;
+using ArchiSteamFarm;
+using SteamKit2;
+
+namespace GUI {
+	internal sealed partial class BotStatusForm : Form {
+		internal static readonly ConcurrentDictionary<string, BotStatusForm> BotForms = new ConcurrentDictionary<string, BotStatusForm>();
+
+		private readonly Bot Bot;
+
+		internal BotStatusForm(Bot bot) {
+			if (bot == null) {
+				throw new ArgumentNullException(nameof(bot));
+			}
+
+			Bot = bot;
+
+			BotForms[bot.BotName] = this;
+
+			InitializeComponent();
+
+			Dock = DockStyle.Fill;
+		}
+
+		internal void OnStateUpdated(SteamFriends.PersonaStateCallback callback) {
+			if (callback == null) {
+				Logging.LogNullError(nameof(callback));
+				return;
+			}
+
+			if (callback.AvatarHash != null) {
+				string avatarHash = BitConverter.ToString(callback.AvatarHash).Replace("-", "").ToLowerInvariant();
+				string avatarURL = "https://steamcdn-a.akamaihd.net/steamcommunity/public/images/avatars/" + avatarHash.Substring(0, 2) + "/" + avatarHash + "_full.jpg";
+				AvatarPictureBox.ImageLocation = avatarURL;
+				AvatarPictureBox.LoadAsync();
+			}
+		}
+
+		private void AvatarPictureBox_LoadCompleted(object sender, AsyncCompletedEventArgs e) {
+			MainForm.UpdateBotAvatar(Bot.BotName, AvatarPictureBox.Image);
+		}
+	}
+}