Adding EmojiHandler to handle an exploit. Adding sendemoji permission and checks.

I know, this is not something important, but I'm going through the new packets one by one and adding events developers can work with, patching exploits, and thought this could be a core permission.

TShockAPI/Handlers/EmojiHandler.cs

@@ -0,0 +1,31 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace TShockAPI.Handlers
+{
+	/// <summary>
+	/// Handles an exploit and checks for permissions.
+	/// </summary>
+	public class EmojiHandler
+	{
+		public void OnEmoji(object sender, GetDataHandlers.EmojiEventArgs args)
+		{
+			if (args.PlayerIndex != args.Player.Index)
+			{
+				TShock.Log.ConsoleError($"EmojiHandler: Packet is spoofing to be player ID {args.PlayerIndex}! - From [{args.Player.Index}]{args.Player.Name}");
+				args.Handled = true;
+				return;
+			}
+
+			if (!args.Player.HasPermission(Permissions.sendemoji))
+			{
+				args.Player.SendErrorMessage("You have no permission to send emotes!");
+				args.Handled = true;
+				return;
+			}
+		}
+	}
+}