Add HEIF/HEIC Support

[GavinL2001]

I take a lot of pictures with my iPhone in heif. It would be nice to convert them without needing to install libheif onto all my machines.

From what I found with a quick google search, there are a couple of go libraries that I think could be implimented. One being the original libheif project, and this older goheif project.

[danvergara]

God knows I tried with libheif. In this PR you can see that I removed it because of a number of reasons. Being honest, what I tried to do was adding support for AVIF, I didn't try to cover HEIF/HEIC. I'll circle back to libehif right after I add support for DOC, DOCX, ODT, and audio.

I'll keep this open until then, so I don't forget.

[GavinL2001]

Awesome! Thanks so much! No need to rush, on this feature. I just figured it'd be a good one to have for those moments when I or someone else would need it.

Thanks for all your hard work!

[darkspadez]

@danvergara What issues were you running into? If i get some free time I can take a look at your original AVIF commit and see if i can come up with a solution or not.

[chaosclarity84]

Came here to comment, would love to have heic support as well.

[FX-Drouard]

same

Came here to comment, would love to have heic support as well.

[The-Padi]

Came here to comment, would love to have heic support as well.

same here