Using DSFML for graphics
dub build --debug=0
./dgol <numberofcellsheight>
Click : change the state of the cell
Space : Keep pressed to evaluate quickly
Backspace : Set all the cell states to dead.
r : Set all the cells to a random state
e : evaluate one step
d : go back from one step in the history of your evaluations
Return : keep pressed to go back quickly in the history of your evaluations