make terrain map load async

src/core/TerrainMapLoader.ts

@@ -29,8 +29,11 @@ export class Terrain {
     constructor(public type: TerrainType) { }
 }
 
-export function loadTerrainMap(): TerrainMap {
-    const fileData = binAsString;
+export async function loadTerrainMap(): Promise<TerrainMap> {
+    // Simulate an asynchronous file load
+    const fileData = await new Promise<string>((resolve) => {
+        setTimeout(() => resolve(binAsString), 100);
+    });
 
     console.log(`Loaded data length: ${fileData.length} bytes`);
 
@@ -40,9 +43,6 @@ export function loadTerrainMap(): TerrainMap {
 
     console.log(`Decoded dimensions: ${width}x${height}`);
 
-    // Log the first 100 bytes of data (including the width and height bytes)
-    // logBinaryAsAscii(fileData, 100);
-
     // Check if the data length matches the expected size
     if (fileData.length != width * height + 4) {  // +4 for the width and height bytes
         throw new Error(`Invalid data: buffer size ${fileData.length} incorrect for ${width}x${height} terrain plus 4 bytes for dimensions.`);