Pass pixelformat value returned by loader component to dithering context initializer
SIXEL loader preserves PAL8 pixel format if possible
Move the sixel loader process as a separated function
Add test sixel images
Add tests for internal indexed processing
Crop images with preserving PAL8 pixel format
Strip trailing spaces
Don't use indexed processing if -m,-e,-I,-b options are specified
Don't use internal indexed processing if less number of colors than the source palette are specified by -p option
Fix warnings of ordered comparison of pointer with integer zero
Load 4bpp indexed PNG without libpng loader
Print more detailed logs on travis
Retrive bit depth of indexed PNG from IHDR chunk
Enable detailed trace if img2sixel is built with --enable-debug option
Fix acesss violation error on 32bit mingw build
Merge branch 'feature-load-paletted-input' into feature-load-grayscaled-input

Conflicts:
	converters/loader.c