Add big endian FTEX support, add deswizzle option (-sw)
New switches:
- -sw / -swizzle = deswizzle (and eventually reswizzle) the texture
- -be / -bigendian = create an FTEX file in big endian
PS3 FTEX's can be converted to and from .dds fine (use the -be / -bigendian option when converting .dds back to .ftex though!)
360 FTEXs should extract fine if you use the -sw / -swizzle switch when converting .ftex to .dds, luminance hasn't had deswizzling added though so that might not extract properly
Note that currently you won't be able to convert .dds files back into 360 FTEX, until reswizzling is added in.