Added icc profile routines

[SalOne22]

@Mikachu2333 this PR adds support for images with icc profile. Could you check that everything work as expected now?
closes #138

[Mikachu2333]

The first img (0047.jpg) would still change color when using default values, for example .\rimage moz *.jpg -s _u. I think it may caused by the option --dithering and I use --dithering 100 to avoid it but nothing happened, this pic's color still be changed from red to green.

(To be honest, it's really hard to distinguish whether the color has changed, and I even believe that the color change in the image is caused by the encoding of the mozjpeg itself.)

(build with gnu target on windows10)

[Mikachu2333]

When input a bmp pic which has a icc tag and output with other codec, rimge output it with wrong color.

bmp.zip

[SalOne22]

pic's color still be changed from red to green.

I suppose that it because I apply ICC profile to srbg profile, so some colors can be loss. I will create another issue to add --preserve flag that will preserve ICC profile on codecs that support metadata.

When input a bmp pic which has a icc tag and output with other codec, rimge output it with wrong color.

This is issue in zune-bmp, decoded image doesn't have ICC profile

[Mikachu2333]

This is issue in zune-bmp, decoded image doesn't have ICC profile

Will this be fixed or just mark as a note in readme, or maybe we'd better make an issue in Here ?

add --preserve flag that will preserve ICC profile on codecs that support metadata

This option is for all supported codecs (include input only codec) or just the formats that allow both input and output? And, some codecs doesn't support icc feature such as qoi etc.

[SalOne22]

Will this be fixed or just mark as a note in readme, or maybe we'd better make an issue in Here ?

Create an Issue in zune-image

This option is for all supported codecs (include input only codec) or just the formats that allow both input and output? And, some codecs doesn't support icc feature such as qoi etc.

If input image has ICC profile and output codec supports writing ICC profile this option will preserve this as a tag in metadata. Otherwise will transform image to srgb profile or does nothing if image doesn't have ICC profile.

[Mikachu2333]

@SalOne22 icc feature in zune-bmp has been fixed.
etemesi254/zune-image#195

[SalOne22]

Okay, while we waiting for new release of zune-image, we can merge this now, and create a new pre-release with partial icc support. This will allow usage of new features, and after new zune-image version add support for bmp files (I don't think that most of the users will face this issue, most of the images on the web are in jpg/png format)

[Mikachu2333]

ok, and I'll approve this and start to work on the better-docs branch.