[sail] Add new port

[HappySeaFox]

Describe the pull request

Draft PR to test a new port: SAIL.

• What does your PR fix? Fixes #
  N/A.

• Which triplets are supported/not supported? Have you updated the CI baseline?
  Only Windows non-static platform is supported. CI baseline is not updated.

• Does your PR follow the maintainer guide?
  Yes.

[ghost]

All CLA requirements met.

[HappySeaFox]

Updated REF to master. I think it's ready for a review.

[HappySeaFox]

@NancyLi1013 Could you please review once more?

[NancyLi1013]

@smoked-herring

Sorry for the delay.

I noticed that there were also some *.pc files in lib/pkgconfig. So it would be better to add vcpkg_fixup_pkgconfig().

I also found that there were some *.info and *.dll files listed in bin/sail/codes. Do you know what these files are used for?

For the usage of sail, have you tested it?

[HappySeaFox]

@NancyLi1013

Thanks for the review!

I noticed that there were also some *.pc files in lib/pkgconfig. So it would be better to add vcpkg_fixup_pkgconfig().

Added vcpkg_fixup_pkgconfig().

I also found that there were some *.info and *.dll files listed in bin/sail/codes. Do you know what these files are used for?

These are dynamically loaded codecs (plugins). They provide actual image decoding capabilities. Static build is not supported for now, so codecs are distributed as standalone DLL plugins.

For the usage of sail, have you tested it?

Yes, there are demo apps. I tested all of them against the port, everything works fine. The only caveat is that a user needs to copy codecs (bin/sail/codecs) and their dependencies by hand into the application directory. I also added a usage file to inform the user about this peculiarity.

[BillyONeal]

Thanks for your contribution!