Interface edits, additions, and fixes:

* Added a new module for exiting the client (client_exit).
* Added tab spacing to the UITabBar class.
* Added tab popup menus for things like channel tabs.
* Impelemented channel tab popup menus (still need to be finished).
* Fixed UITabBar tab draging (will now change after dragged half way over the
  next tab, not 2 pixels).
* Fixes to the client_options module.
* Edited some UI settings.
* Changed game_cooldown and game_spelllist menu button icons.
* Fixed some typos.

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

@@ -13,7 +13,6 @@ TabBarButton < UIButton
   padding: 5
   anchors.left: parent.left
 
-
   $hover !checked:
     image-clip: 0 20 20 20
     color: white
@@ -24,7 +23,7 @@ TabBarButton < UIButton
 
   $checked:
     image-clip: 0 40 20 20
-    color: #80c7f8
+    color: #D8E7F0
 
   $on !checked:
     color: #F55E5E