Prevent further things from clients who dont handshake

- The player will only finish the handshake once they spawn their player, a normal client would always do this eventually.

- They cannot chat, even if they request world data but just not spawn their player.

- Other clients will not be notified of their join/leave in both cases (dont request WD or do but dont spawn)

- And most importantly, they do not show on the in game player list but still show on the server console /playing cmd.

TShockAPI/GetDataHandlers.cs

@@ -2726,6 +2726,8 @@ namespace TShockAPI
 			short numberOfDeathsPVP = args.Data.ReadInt16();
 			PlayerSpawnContext context = (PlayerSpawnContext)args.Data.ReadByte();
 
+			args.Player.FinishedHandshake = true;
+
 			if (OnPlayerSpawn(args.Player, args.Data, player, spawnx, spawny, respawnTimer, numberOfDeathsPVE, numberOfDeathsPVP, context))
 				return true;
 
@@ -2762,6 +2764,7 @@ namespace TShockAPI
 				args.Player.Dead = true;
 			else
 				args.Player.Dead = false;
+
 			return false;
 		}