ZYZX + DXT5 for normal maps, ozDDS++

- client
  * normal maps are now in ZYZX (+DXT5) format
- ozFactory
  * ImageBuilder
    + YYYX and ZYZX swizzling options for DXT5nm
    + TGA loading fixed
    + condition for compression: mupluple of 4 dimensions
- tools
  * ozDDS: new options for new ImageBuilder functions