Moved all the data files (translations, skins...) to the "data" folder.

On the "platform" sub-folder are located one folder for each platform gmenu2x supports.
The "translations" folder is now the same for all platforms.
The "skins" sub-folder contains directories which names defines the screen resolution of the contained skins (e.g. "320x240").

data/skins/800x480/Default/skin.conf

@@ -0,0 +1,9 @@
+messageBoxBorder=#505050ff
+topBarBg=#ffffff80
+selectionBg=#ffffff80
+messageBoxBg=#00000080
+messageBoxSelection=#fffffff80
+bottomBarBg=#ffffff80
+topBarHeight=50
+linkHeight=50
+linkWidth=80

data/skins/800x480/Default/wallpapers/README

@@ -0,0 +1,10 @@
+    picture lisensed at :
+     http://creativecommons.org/licenses/by-sa/2.0/deed.en
+     http://creativecommons.org/licenses/by/2.0/deed.en
+    
+    URL:
+a.png		http://www.flickr.com/photos/libertinus/891434640/sizes/z/in/photostream/
+b.png		http://www.flickr.com/photos/hamed/281311122/sizes/z/in/photostream/
+c.png		http://www.flickr.com/photos/55948751@N00/3831916479/sizes/m/in/photostream/
+d.png		http://www.flickr.com/photos/theklan/1276710183/sizes/z/in/photostream/
+socratesg.png	http://en.qi-hardware.com/wiki/File:Socratesg.png

data/skins/800x480/Default/wallpapers/default.png

@@ -0,0 +1 @@
+open.png