Move maps generation out of repo, new map structure (#1256)

## Description:

Move map generation outside of main repo, it has been rewritten in Go
and is much faster. Also refactor how maps are stored, one dir per map.
The map binaries are basically identical to before. Some maps like
Africa have 1% difference in bytes, but playing it looks exactly the
same.

Use lazy loading for map data access so only needed files are accessed.

Unit tests now load map binary instead of regenerating it from scratch,
speeding them up.

## Please complete the following:

- [x] I have added screenshots for all UI updates
- [x] I process any text displayed to the user through translateText()
and I've added it to the en.json file
- [x] I have added relevant tests to the test directory
- [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:
evan

package.json

@@ -1,7 +1,6 @@
 {
   "name": "openfront-client",
   "scripts": {
-    "build-map": "node --loader ts-node/esm --experimental-specifier-resolution=node src/scripts/generateTerrainMaps.ts",
     "build-dev": "webpack --config webpack.config.js --mode development",
     "build-prod": "webpack --config webpack.config.js --mode production",
     "start:client": "webpack serve --open --node-env development",

resources/lang/en.json

@@ -160,6 +160,9 @@
     "regional": "Regional",
     "fantasy": "Other"
   },
+  "map_component": {
+    "loading": "Loading..."
+  },
   "private_lobby": {
     "title": "Join Private Lobby",
     "enter_id": "Enter Lobby ID",

resources/maps/asia/manifest.json

@@ -1,7 +1,5 @@
 {
   "name": "Asia",
-  "width": 2000,
-  "height": 1200,
   "nations": [
     {
       "coordinates": [165, 422],