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_exit/exit.lua

@@ -0,0 +1,59 @@
+Exit = {}
+
+local exitWindow
+local exitButton
+
+function Exit.init()
+  exitButton = TopMenu.addRightButton('exitButton', tr('Exit Client'), 'exit.png', Exit.tryExit)
+
+  connect(g_game, {
+    onGameStart = Exit.hide,
+    onGameEnd = Exit.show
+  })
+end
+
+function Exit.terminate()
+  disconnect(g_game, {
+    onGameStart = Exit.hide,
+    onGameEnd = Exit.show
+  })
+
+  if exitWindow then
+    exitWindow:destroy()
+    exitWindow = nil
+  end
+  
+  if exitButton then
+    exitButton:destroy()
+    exitButton = nil
+  end
+
+  Exit = nil
+end
+
+function Exit.hide()
+  if exitWindow then
+    exitWindow:destroy()
+  end
+  exitButton:hide()
+end
+
+function Exit.show()
+  exitButton:show()
+end
+
+function Exit.tryExit()
+  if exitWindow then
+    return true
+  end
+
+  local yesFunc = function() scheduleEvent(exit, 10) end
+  local noFunc = function() exitWindow:destroy() exitWindow = nil end
+
+  exitWindow = displayGeneralBox('Exit', tr("Do you really want to exit?"),
+  { { text='Yes', callback=yesFunc },
+    { text='No', callback=noFunc },
+    anchor=AnchorHorizontalCenter }, yesFunc, noFunc)
+
+  return true
+end