Handle map reset when the game is loaded/unloaded.

https://github.com/dcs-liberation/dcs_liberation/issues/2039

Partial fix for
https://github.com/dcs-liberation/dcs_liberation/issues/2045 (now works
in the new map, old one not fixed yet).

client/src/api/gamestate.ts

@@ -0,0 +1,17 @@
+import { AppDispatch } from "../app/store";
+import { gameLoaded, gameUnloaded } from "./actions";
+import backend from "./backend";
+import Game from "./game";
+
+export default function reloadGameState(dispatch: AppDispatch) {
+  backend
+    .get("/game")
+    .catch((error) => console.log(`Error fetching game state: ${error}`))
+    .then((response) => {
+      if (response == null || response.data == null) {
+        dispatch(gameUnloaded());
+        return;
+      }
+      dispatch(gameLoaded(response.data as Game));
+    });
+}