Remake John Conway's Game Of Life -Practice Mode

Saving still does not work in Opera sorry

Added a practice mode to the game.

In practice mode you are able to manually go through one frame at a time.

Alive cells that will die turn red, Dead cells that will become alive turn green

This allows for easy testing and learning how the simulation work.

If you have any suggestions just leave a comment.

This is a remake and not my game nor idea this is a link to the wiki: https://en.wikipedia.org/wiki/Conway%27s_Game_of_Life