Add support for JPG images

RemoteLoader.gd

@@ -1,9 +1,19 @@
 extends HTTPRequest
 
 func GetRemoteImage(url):
+	var image = Image.new()
 	print("Fetching remote image %s" % url)
 	request(url)
 	var res = await request_completed
-	var image = Image.new()
-	image.load_png_from_buffer(res[3])
+	var magicBytes = res[3].slice(0,8)
+	print(magicBytes)
+	var error = null
+	if 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]):
+		print("Detected JPG File")
+		error = image.load_jpg_from_buffer(res[3])
+	if error != OK:
+		print("Error fetching image ", str(error))
 	return image