u2f over nfc

https://github.com/flipperdevices/flipperzero-firmware/pull/1755
from @devsnek

may need more testing

scripts/flipper/assets/icon.py

@@ -60,7 +60,10 @@ class ImageTools:
         with Image.open(file) as im:
             with io.BytesIO() as output:
                 bw = im.convert("1")
-                bw = ImageOps.invert(bw)
+                try:
+                    bw = ImageOps.invert(bw)
+                except OSError:
+                    bw = bw.point(lambda x: 255 - x)
                 bw.save(output, format="XBM")
                 return output.getvalue()