Revert "Remove Utils.ActivePlayers"

This reverts commit b613fdcda6.

TShockAPI/Utils.cs

@@ -149,6 +149,15 @@ namespace TShockAPI
 			}
 		}
 
+		/// <summary>
+		/// Gets the number of active players on the server.
+		/// </summary>
+		/// <returns>The number of active players on the server.</returns>
+		public int ActivePlayers()
+		{
+			return Main.player.Where(p => null != p && p.active).Count();
+		}
+
 		//Random should not be generated in a method
 		Random r = new Random();
 
@@ -1108,7 +1117,7 @@ namespace TShockAPI
 			}
 			else
 			{
-				invasionSize = 100 + (TShock.Config.InvasionMultiplier * TShock.Players.Length);
+				invasionSize = 100 + (TShock.Config.InvasionMultiplier * ActivePlayers());
 			}
 
 			// Order matters
@@ -1142,12 +1151,12 @@ namespace TShockAPI
 		}
 
 		/// <summary>Updates the console title with some pertinent information.</summary>
-		/// <param name="empty">If the server is empty; determines if we should use TShock.Players.Length for player count or 0.</param>
+		/// <param name="empty">If the server is empty; determines if we should use Utils.ActivePlayers() for player count or 0.</param>
 		internal void SetConsoleTitle(bool empty)
 		{
 			Console.Title = string.Format("{0}{1}/{2} on {3} @ {4}:{5} (TShock for Terraria v{6})",
 					!string.IsNullOrWhiteSpace(TShock.Config.ServerName) ? TShock.Config.ServerName + " - " : "",
-					empty ? 0 : TShock.Players.Length,
+					empty ? 0 : ActivePlayers(),
 					TShock.Config.MaxSlots, Main.worldName, Netplay.ServerIP.ToString(), Netplay.ListenPort, TShock.VersionNum);
 		}