Implement basic node side image caching

RemoteLoader.gd

@@ -3,17 +3,33 @@ extends HTTPRequest
 func GetRemoteImage(url):
 	var image = Image.new()
 	print("Fetching remote image %s" % url)
+	var urlHash = str(url.hash())
+	var outFile = "{dir}/{hash}-{fileName}.png".format({
+		'dir': $"/root/Main".cache_dir,
+		'hash': urlHash,
+		'fileName': url.get_file().rsplit(".", true, 1)[0]
+	})
+
+	if FileAccess.file_exists(outFile):
+		image.load(outFile)
+		print("Loaded image from cache. " + outFile)
+		return image
+	
+	timeout = 1000
 	request(url)
 	var res = await request_completed
 	var magicBytes = res[3].slice(0,8)
 	print(magicBytes)
+	var fileType = url.get_extension()
 	var error = null
-	if magicBytes == PackedByteArray([137, 80, 78, 71, 13, 10, 26, 10]):
+	if fileType == "png" or magicBytes == PackedByteArray([137, 80, 78, 71, 13, 10, 26, 10]):
 		print("Detected PNG File")
 		error = image.load_png_from_buffer(res[3])
-	if magicBytes == PackedByteArray([255, 216, 255, 224, 0, 16, 74, 70]):
+	if ["jpg", "jpeg"].has(fileType) or magicBytes == PackedByteArray([255, 216, 255, 224, 0, 16, 74, 70]):
 		print("Detected JPG File")
 		error = image.load_jpg_from_buffer(res[3])
 	if error != OK:
 		print("Error fetching image ", str(error))
+	image.save_png(outFile)
+	print("Saved new image to cache. " + outFile)
 	return image