#7 frame and anim delay don't work

[Drew Sikora]

When you enter in values for the frame and animation
delays in the sprite engine nothing seems to happen.
The way it works now is that each Animate call updates
a counter. When the counter reaches the number set for
the delay the animation is advanced a frame or started
over again. The counter is reset to zero and the process
starts again. Perhaps what should be done is make use
of a timer object, either in SDL or a low-level clock so
that we can remove the loop and use milliseconds
rather than game loops as a time constant.