GetFrameDelay -- get frame presentation time stamp (V5.0)
int delay = GetFrameDelay(APTR handle, int frame);
This function must return the presentation time stamp of the specified frame. Frame indices are
counted from 0 to number of frames minus 1. Presentation time stamp means the duration that this
frame should be shown before skipping to the next frame. This value has to be specified in milliseconds.
If the animation format doesn't support frame-based time stamps you can also return a global
frame delay value here or even 0. Returning 0 for every frame will display the animation as
fast as possible.