Upgrade to stb_image v2.19

[tianxiaogu]

This fixes the following issue: #34 #38 #36 #37 #39.

#40 turns out to be a heap-use-after-free error. Please review the usage of the following two API from stb.

• stbi__gif_load_next
• stbi__load_main

[posva]

Nice, thanks! Do you think you could add back ico support (#24), it seems to be removed right now.
It doesn't seem to handle gifs correctly anymore either

[tianxiaogu]

The patch just replaces the new stb_image.h and fixes some incompatible API usage with default arguments. Sorry for not validating more. I will try to resolve it later this weekend.

[posva]

ok, thanks!

[tianxiaogu]

Hi @posva , I have made two additional commits in this pull request. Now it works on gif and ico. Could you look over them? I have no knowledge about any image file format.

[posva]

Hey, it still doesn't work with GIFs

[tianxiaogu]

Hi, I am sorry for not testing the patch with multi-frame gifs. I reverted the previous patch on gif and made a new commit. The crash seems to be fixed by the new patch (3fa8440). Thanks.

[posva]

Thanks!

[highvoltage]

@posva Hi! Do you mind tagging a new release now that this is fixed? thanks!

[posva]

Done, If someone could create the PRs to homebrew that would be perfect. Otherwise I will do in Xmas