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
    + DDS writer should now produce headers equivalent to gimp-dds-plugin
- tools
  * ozDDS: new options for new ImageBuilder functions
Normal map detection, image flopping

- ozFactory
  * ImageBuilder: horizontal flip (flop), normal map detection
- tools
  * ozDDS changed parameters to support new ImageBuilder features