New Post: Rewind feature discussion

Now states are created in a much better manner.

Interval is based on number of vblanks. On NTCS there are 60 and PAL 50 vblanks per second.
Count is the same max. number of states that are kept in shm memory.

Also one future consideration would be to implement simple fading filter so that rewinding would be visually much more appealing, i.e. not just jumping frames back.