Add Figures (Map Images) to OPORDS

[E.Hermanson]

I used to use this back when I actually created OPORD overlays in external software instead of just using the in-game map. We used one to plan the invasion of Lingor, too. It's pretty neat, but it has a few key drawbacks: first, the grid squares aren't actually labelled, so you can't tell what each grid square is, just its delineation. It's also a ridiculously large file, which makes it kind of unwieldy for anything but centralized collaboration -- God help you if you're trying to send and share it.