Fixed dark textures by regenerating mips on DXT1 ace files with only 1 mip level.
Fixed ability to textures with sizes not a power of 2 ie cab view images.
git-svn-id: http://svn.uktrainsim.com/svn/openrails/trunk@345 a9f3cfff-6c41-7446-b0ca-052bd761e6eb