Added new features to the options.

* Added 'enable smart walk' and 'show connection ping' options.
* Minor tidy ups.

modules/client_skins/skins/default/styles/labels.otui

@@ -36,7 +36,7 @@ PingLabel < Label
   font: verdana-11px-rounded
   @onSetup: |
     self.updateEvent = cycleEvent(function()
-      if g_game.isOnline() then
+      if g_game.isOnline() and Options.getOption('showPing') then
         local ping = -1
         if g_game.getFeature(GameClientPing) then
           ping = g_game.getPing()