Warn players if they can't modify the world

This reimplements warnings that CheckTilePermissions previously had. It
defaults to on because every single call currently in TShock expects it
to be on.

TShockAPI/Bouncer.cs

@@ -533,11 +533,8 @@ namespace TShockAPI
 			short y = args.Y;
 			byte homeless = args.Homeless;
 
-			// Calls to TShock.CheckTilePermission need to be broken up into different subsystems
-			// In particular, this handles both regions and other things. Ouch.
 			if (!args.Player.HasBuildPermission(x, y))
 			{
-				args.Player.SendErrorMessage("You do not have access to modify this area.");
 				args.Player.SendData(PacketTypes.UpdateNPCHome, "", id, Main.npc[id].homeTileX, Main.npc[id].homeTileY,
 									 Convert.ToByte(Main.npc[id].homeless));
 				args.Handled = true;