Implemented the mount interface, Fixed some interface stuff, Some cosmetics, and Updated the outfits window

* Added new arrow buttons.
* Fixed the vertical separator.
* Added new game_playermount module to handle player mounting.
* Moved the battle icons to /images.
* Outfit window accommodates for mounts, loads addons more efficiently and keeps addons set on update, added new Outfit.randomize function that allows you to randomize your outfit colors, and set up a new layout.

modules/game_playermount/playermount.otmod

@@ -0,0 +1,15 @@
+Module
+  name: game_playermount
+  description: Manage player mounts
+  author: BeniS
+  website: www.otclient.info
+
+  dependencies:
+    - client_entergame
+
+  @onLoad: |
+    dofile 'playermount'
+    PlayerMount.init()
+
+  @onUnload: |
+    PlayerMount.terminate()