Load a json file that describe a tileset in Tile format.

Then add it to the tilemap of the GameScene
Then add if to the GameMap

front/src/Api/Events/LoadTilesetEvent.ts

@@ -0,0 +1,12 @@
+import * as tg from "generic-type-guard";
+
+export const isLoadTilesetEvent = new tg.IsInterface()
+    .withProperties({
+        url: tg.isString,
+    })
+    .get();
+
+/**
+ * A message sent from the iFrame to the game to add a message in the chat.
+ */
+export type LoadTilesetEvent = tg.GuardedType<typeof isLoadTilesetEvent>;