Add Giant World Map (#845)

## Description:
Adds giant world map. Uses same nations as former world map. Does not
include translations beyond English.
## Please complete the following:

- [x] I have added screenshots for all UI updates
- [x] I confirm I have thoroughly tested these changes and take full
responsibility for any bugs introduced
- [x] I understand that submitting code with bugs that could have been
caught through manual testing blocks releases and new features for all
contributors

## Please put your Discord username so you can be contacted if a bug or
regression is found:

1brucben

---------

Co-authored-by: evanpelle <evanpelle@gmail.com>

src/scripts/generateTerrainMaps.ts

@@ -7,6 +7,7 @@ const maps = [
   "Africa",
   "Asia",
   "WorldMap",
+  "WorldMapGiant",
   "BlackSea",
   "Europe",
   "EuropeClassic",