add chat panel, send text messages, guard forbidden functions with an ifdef

modules/skills/skills.lua

@@ -43,4 +43,7 @@ end
 function Game.setSkill(id, level, percent)
   local skillPanel = skillWindow:getChildById('skillPanel')
   local levelLabel = skillPanel:getChildById('skillLevel' .. id)
-end
+end
+
+connect(Game, { onLogin = Skills.create,
+                onLogout = Skills.destroy })

modules/skills/skills.otmod

@@ -9,10 +9,6 @@ Module
 
   onLoad: |
     require 'skills'
-    Skills.create()
     return true
 
-  onUnload:
-    Skills.destroy()
-