Fix visualization for populated areas and larger maps

[joey-obrien]

Since paths can go through other populated areas for the map generation code, right now populated areas do not appear on the map because the path color dominates over the populated area color. We should change this. Additionally, once the path becomes bigger than 40 x 40 the map grid bleeds into the underlying area.

[joey-obrien]

Guman also requested a cell color for if a populated area finished evacuating

[joey-obrien]

Created a list called "finished_evacuating_cells" that records all the populated cells that have successfully evacuated

[joey-obrien]

We should also have it so that the timestamps can progress without the user having to exit out of the window