WMPicView image viewer doesn't support viewing an animation
Adapt the WMPicView image viewer to viewing of an animation. There are some issues blocks this. The current interface of animation decoders does not assume either the recieving of the first frame or the size of the animation. This does not allow viewer application to: make an application icon and set the window dimensions. Also, for large animation files, decoding of all frames takes noticeable time. It is proposed to add a new extended interface for animation decoders, which allows not to decode the entire set of frames at once, but to decode them frame by frame. This will allow getting the first frame for the viewer and improve the user experince (spare the user from waiting for decoding of all frames)