Completely remove support for legacy style skins. All legacy skinning options are...

Completely remove support for legacy style skins. All legacy skinning options are now part of a SkinLegacy/LegacySkinTemplate pair that inherits from the normal SkinTemplate setup. Also ported our three built in skins to use the new legacy classes. ( ;) if you want to kill legacy skins now, you only have to svn rm 4 files)