Re-add destroying for unloading, other clean up:

* Cleaned some module terminate code
* Fixed "reload all" issues

modules/client_entergame/entergame.lua

@@ -136,11 +136,17 @@ function EnterGame.terminate()
   removeEvent(autoLoginEvent)
   enterGame:destroy()
   enterGame = nil
+  enterGameButton:destroy()
+  enterGameButton = nil
   protocolBox = nil
   if motdWindow then
     motdWindow:destroy()
     motdWindow = nil
   end
+  if motdButton then
+    motdButton:destroy()
+    motdButton = nil
+  end
   if loadBox then
     loadBox:destroy()
     loadBox = nil