MAPG-73 pass mapId to GameController and PositionController

adapt JS to send mapId
make separate JS for the game

views/game.php

@@ -48,9 +48,10 @@
         </div>
     </div>
     <script>
+        var mapId = '<?= $mapId ?>';
         var mapBounds = <?= json_encode($bounds) ?>;
     </script>
     <script src="https://maps.googleapis.com/maps/api/js?key=<?= $_ENV['GOOGLE_MAPS_JS_API_KEY'] ?>"></script>
-    <script src="static/js/mapguesser.js"></script>
+    <script src="static/js/game.js"></script>
 </body>
 </html>