Support for animated WEBP

[SquirrelKiev]

Currently standard webp support works fine, but animated webps do not get an icon. Any chance this could get support?

[SquirrelKiev]

Image above was from 3.3.3 Beta 1, but i've just tested on 3.3.3 Beta 2 and get the same issue. I will note the default photo thumbnail provider built-in to windows does support webp however? Uses the first frame of the webp.

[Xanashi]

This will be supported soon-ish. I know it's being worked on in FFmpeg, and I also have an alternative solution planned,
if the FFmpeg implementation is not finished.