Delete comparison images
CrnLib: deleted examples
EtcPack: clean up
FreeImage 3.16.0 build files
rg-etc1 license and porting info
LibKtx removed (not used)
Bump PvrTexTool version from 4.13 to 4.5
Cumulative patch

- Better support for ETC2 compression
- Cleanups and fixes
- drop requirements doe ddraw,h (DDS headers now described, with all
hacks applied)
- General processing cleanup (there will be more patches) in order to
get better sRGB support
- omnilib moved to libs/ folder
- new test scripts cover sRGB compressino and ETC1/ETC2 and DXT swizzled
formats