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.otmod

@@ -0,0 +1,16 @@
+Module
+  name: client_exit
+  description: Handles the exit exit of the client (for cases of fullscreen)
+  author: BeniS
+  website: www.otclient.info
+
+  dependencies:
+    - client_topmenu
+    - client_entergame
+
+  @onLoad: |
+    dofile 'exit'
+    Exit.init()
+
+  @onUnload: |
+    Exit.terminate()