Fix remaining errors and enable strict mode (#1628)

## Description:

#1075 

Fixing all remaining type errors caused by strict mode and enable it.

## 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 have read and accepted the CLA agreement (only required once).

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

azlod

---------

Co-authored-by: Scott Anderson <662325+scottanderson@users.noreply.github.com>

src/core/game/FetchGameMapLoader.ts

@@ -17,7 +17,9 @@ export class FetchGameMapLoader implements GameMapLoader {
       return cachedMap;
     }
 
-    const key = Object.keys(GameMapType).find((k) => GameMapType[k] === map);
+    const key = Object.keys(GameMapType).find(
+      (k) => GameMapType[k as keyof typeof GameMapType] === map,
+    );
     const fileName = key?.toLowerCase();
 
     if (!fileName) {